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I now have a 20" and an 11.3" pistol in 7.62x40 wt and love the round! I have shot the Hornady 125 SST into 1 moa with 25grn of 1680.
125grn Noslers shoot into .80 with 4 of the 5 shots into 1 ragged hole , again with 25grn of 1680.The Speer 130 grn HP shoot into about 1.3" for me with 24.2 grn of 1680. I love the big gapping hole in the end of these Speers! Allways gets a comment from my fellow shooters that come over to see what caliber im shooting. Haven't chrono'ed any of these loads so im not sure of their velocity.Hope to get a chance to take the 20" hunting this year. |
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Put mine to use yesterday. A decent eight point came by following four does. It was an 80 yard shot and the deer ran about 30 yards before dropping and going over the side of a small cliff. Getting it off the mountain was a job.
125 grain Nosler Ballistic Tips behind 25 grains of 1680. The bullet went through and through and left a decent blood trail. |
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I noticed Lee has 7.62 x 40 WT Factory Crimp Die listed on there web site.
http://leeprecision.com/7.62-x-40-wt-custom-factory-crimp-die.html |
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Nice!!
I still haven't built mine yet. I've got about half the parts I need. Can't decide what rail system or free float tube i want to use on it. |
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Well Santa brought my dies and case gauge. Only problem is I can't find any 1680. The local shop has Norma 200 which is another fast burning powder they suggested but I have never worked up a load myself and I don't have a chrony. I also have a bunch of IMR4895 sitting around but I don't think I would be able to get anything worth shooting with that powder.
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Only problem is I can't find any 1680 View Quote Don't feel like the Lone Ranger! You can check out the beginning of the thread and it shows the testing and results of several powders, but without a doubt 1680 is the main powder for this cartridge. It was only a year or so ago that we couldn't get the 125 grain bullets and they finally came back to the market, but now it is the powder. This shortage has run way too long. |
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Keeping it alive.
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Does anyone make a reamer to go from 300 blk to 762x40? Ill bet that is a bit too much reaming though. I have a bolt gun i shoot subs in and would like to convert so I can build an AR in 762x40 as well.
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Originally Posted By GGGBeo50: Does anyone make a reamer to go from 300 blk to 762x40? Ill bet that is a bit too much reaming though. I have a bolt gun i shoot subs in and would like to convert so I can build an AR in 762x40 as well. View Quote The OP of this thread (Kurt) the designer of the 7.62x40 has recambered .300 whisper/fireball/blackout to 7.62x40 but stated sometimes the barrel has to be setback one turn to completely clean up the old chamber. I'd contact him. Wilson Combat has also recambered .300 BLK AR barrels to 7.62x40 for customers. Pacific Tool and Gauge makes Wilson's 7.62x40WT reamer if you want to do it yourself.
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Originally Posted By quick1911:
The OP of this thread (Kurt) the designer of the 7.62x40 has recambered .300 whisper/fireball/blackout to 7.62x40 but stated sometimes the barrel has to be setback one turn to completely clean up the old chamber. I'd contact him. Wilson Combat has also recambered .300 BLK AR barrels to 7.62x40 for customers. Pacific Tool and Gauge makes Wilson's 7.62x40WT reamer if you want to do it yourself. View Quote View All Quotes View All Quotes Originally Posted By quick1911:
Originally Posted By GGGBeo50:
Does anyone make a reamer to go from 300 blk to 762x40? Ill bet that is a bit too much reaming though. I have a bolt gun i shoot subs in and would like to convert so I can build an AR in 762x40 as well. The OP of this thread (Kurt) the designer of the 7.62x40 has recambered .300 whisper/fireball/blackout to 7.62x40 but stated sometimes the barrel has to be setback one turn to completely clean up the old chamber. I'd contact him. Wilson Combat has also recambered .300 BLK AR barrels to 7.62x40 for customers. Pacific Tool and Gauge makes Wilson's 7.62x40WT reamer if you want to do it yourself. good to know, is the throat of the 762x40 long enough to chamber a 220g otm so I dont lose my subsonic fun on my bolt gun? |
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just a cursory comparison of the chambers.....7.62x40 - 300 whis/blk depending on who makes the 300-221 - 300 whis - 300 blk.....the base dimensiom can be a few thow more in diameter than the x40....so there can be a slight transition from the original chamber to the new....ends up the base dimension blows out a little more than needed and gets exercised a little more with the sizing die....some people can live with it, others want to clean the chamber up the full length...so resetting the extension is in order.....most clean up fine without resetting the extension, but some do need it.... most of the rechambers we did were for expedience of an availabe barrel for testing, or repurpose a barrel we'd never use again in its original chamber.....it works, a little less than ideal in my opinion, but it works....1:7, 1:8 twist is a bit fast in my oinion for most super-sonic loads in the x40....if you want to shoot heavy ( ~ 200gr) supers or subs then the faster twists apply....staying with the original design intent of ~ 110 to 125gr 1:12 / 1:14 are what I usually go with...1:10 is a pretty good compromise for many weights.... the x40 from its inception was that of an improvement on the 300-221 / 300 whis super-sonic capabilities...the layout was set short free-bore using bullets like the 125 TNT loaded to 2.250"-2.260"......so its use in the AR was primary, bolt-gun secondary...we've done various free-bore length bolt-gun reamers for long loading all sorts of suer-sonic fodder... |
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" The only way I got to keep them Tigers busy is to let them shoot holes in me..."
" tore away the bottom and saw life is a test " |
I know this has been posted before, but would anyone here be able to send me some load info? Ihad some but lost itduring my move to Alaska. Any help would be great
thanks Aaron |
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Originally Posted By MADK0W64:
I know this has been posted before, but would anyone here be able to send me some load info? Ihad some but lost itduring my move to Alaska. Any help would be great thanks Aaron View Quote Here is the reloading data link from Wilson's...They are for the 16" Bbl. length. http://www.wilsoncombat.com/press/7.62x40%20WT%20Barnes%20Data.pdf For the 18" & 20" barreled versions "slower" powders in the AA1680 burn rate range will work better (mid length gas sys.). Good luck. |
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Originally Posted By Dr69er:
Here is the reloading data link from Wilson's...They are for the 16" Bbl. length. http://www.wilsoncombat.com/press/7.62x40%20WT%20Barnes%20Data.pdf For the 18" & 20" barreled versions "slower" powders in the AA1680 burn rate range will work better (mid length gas sys.). Good luck. View Quote View All Quotes View All Quotes Originally Posted By Dr69er:
Originally Posted By MADK0W64:
I know this has been posted before, but would anyone here be able to send me some load info? Ihad some but lost itduring my move to Alaska. Any help would be great thanks Aaron Here is the reloading data link from Wilson's...They are for the 16" Bbl. length. http://www.wilsoncombat.com/press/7.62x40%20WT%20Barnes%20Data.pdf For the 18" & 20" barreled versions "slower" powders in the AA1680 burn rate range will work better (mid length gas sys.). Good luck. Dr69er, I have that info, about a year ago maybe more someone, cant remeber who, sent me an excel file from here that had alot of load data on if for various loads for the 40wt(I lost it in a reformatting of my tablet). I was just curious if anyone had any other info out there. Thanks though |
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it was probably me pm me and i can send it to you again
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Looks good man. I've got 95% of the parts for my build, but no clue when I'll finally slap it together.
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275 pound boar
https://www.youtube.com/watch?v=Mv-_TWtcFQ8 |
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" The only way I got to keep them Tigers busy is to let them shoot holes in me..."
" tore away the bottom and saw life is a test " |
I am loading the 130 grn speer varmit HP over 24.5 grn of 1680.
shooting them thru my 20" barrel from Wilson I don't have a chrono or access to one, anyone have a guess as to the velocity thanks in advance!!! |
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Originally Posted By CAWest:
I am loading the 130 grn speer varmit HP over 24.5 grn of 1680. shooting them thru my 20" barrel from Wilson I don't have a chrono or access to one, anyone have a guess as to the velocity thanks in advance!!! View Quote Seems like a hot load according to the load computer...velocity should be in the 2,470-2,500 fps range... |
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Thank you Sir!
I'll just pull the others, primers too flat for me. i'll drop back to 24grn, those seemed fine in my rifle. Cant seem to find to much load data for that particular bullet. Thanks again |
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40,
Can you please post velocity data for the 11.3" barrels? I have a bushmaster ACR and really want to SBR it. I already own a 14.5" 300BLK barrel with pistol gas, but a using a pistol gas system on an ACR is a giant pain in the butt. I've recently begun to think that the 11.3" x40 with carbine gas is the way to go. Thanks in advance! Joe M |
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40,
As a follow-up to my previous question, what about the x40 load lets it function with a carbine gas system in an 11.3" barrel, whereas most if not all short 300blk systems use pistol gas? My goal is to have an SBR ACR package that will accelerate a .30 cal projectile as much as possible. Like I said, I'm restricted to only using carbine and longer gas systems to avoid heavy machine work on the charging handle tray. Given my circumstances, would I be better off building a 300BLK barrel set or a 7.62x40 barrel set? Thanks again, JoeM |
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Joe M,
The 40 is dedicated to getting the most it can out of the 110-135gr. bullets. This means supersonic. Thus, enough gas is generated for the carbine lenght system to work reliably. The 35 can be used to drive 170-220gr. bullets subsonic, This means only a small amount of gas is generated. It does not take much to achieve just under 1000"/sec. So, in order for the 35 to work reliably for BOTH supersonic and sub it need the pistol length system. If you only use your 35 for supersonic loads a longer gas system will should work equally well. If your goal is speed Kurt optimized the 40 for supersonic. Its preferred bullet weights, chamber and twist rates were carefully choosen for performance from a small package. The 35's increased degree of rifling might stabilize heavier 168 gr. bullets better than the 40. But, a bullet, this large, has a displacement cost. It eats volume in the case which would be better used by powder, if your goal is speed. You will have passed the point of diminishing returns, but, it does illustrate the need to take mass into consideration as well as velocity. DB |
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Thank you DB, great explanation. That helps me a lot.
I guess to clarify I'm looking for near x39 performance in a short package (hence my comment on velocity). So it sounds since I'm not looking for subsonic performance, my pistol gas x35 barrel needs to go. I'll throw it on EE shortly. |
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Still no rough velocity data on the 11.3" barrels? Google isn't turning up much. Any help appreciated.
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Originally Posted By mxracer72:
Still no rough velocity data on the 11.3" barrels? Google isn't turning up much. Any help appreciated. View Quote For a 11.3" barrel with a 125 gr. projectile your muzzle velocity will be right around 2,280 fps. to 2,303 fps. The 16" barrel version with the same load gets around 2,463 fps.so that runs about 35 fps loss per Inch or so. Good luck. |
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Thanks Dr!
Joe |
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I'm tagging this thread for future reading. all 66 pages...
I recently got my 20" barrel and started load development. It's been interesting. I need to read through this thread to see if anyone is using FC cases or what peoples H2O capacities are with LC brass. My FC is 28.77 H2O grains unfired and 29.38 fired. Considerably less than QuickLoads databse of 32gr and I assume what was used for Wilson's data. I chronographed some H110 loads and decided that the Burn Rate is too inconsistent for me. 18.2gr @ 2194 fps and 19.2gr @ 2289 fps one day and 18.5gr @ 2179 fps the other. It will be consistent for that day only for some reason. This type of inconsistency happened with my .300 Blkout as well. Just skimming the last few pages on this thread tells me that my thoughts of 1680 are on the right track. Running the 110GR numbers in QL, one node is around 2330 fps, and the next fastest node is estimated in the 2500's but is 5k over Saami. 125's come out at an estimated 2173 fps but I can probably reach the next highest at 2283 fps. Still need to adjust for 1680's burn rate. I'm curious to know what the H2O capacity is for LC cases or even for WCC cases. |
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Nice blaster. Your scope is canted to the left quite a bit, in case you didn't notice.
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Thanks. Just snapped a few pics before getting down to business.
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Just thought I'd let the team know there's a smaller company out there offering 7.62x40 barrels, ready-to-load brass, magazine bands and loaded ammo shortly...
Google "7.62x40 Products", and look about 5 listings down... Revitalizing the x40 seems to be someone's plan. |
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You're going to be a happy camper.
Go with a 3-9 just to start with until you get the barrel broken in. Load up some 125's with 1680 and be happy with sub-MOA. Both of my rifles performed very well after they hit the 100 round mark and I couldn't be happier. I will say that I have found a 1.5-4 Leupold VX-R more than enough scope out to about 500 yards. |
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Originally Posted By Graycard:
You're going to be a happy camper. Go with a 3-9 just to start with until you get the barrel broken in. Load up some 125's with 1680 and be happy with sub-MOA. Both of my rifles performed very well after they hit the 100 round mark and I couldn't be happier. I will say that I have found a 1.5-4 Leupold VX-R more than enough scope out to about 500 yards. View Quote Thanks! This is definitely new territory for me. Never had a gun that I couldn't buy ammo for locally, and I'm new to reloading as well. I've got 100 of the 125 grain Sierra Pro hunters and I just ordered a pound of 1680 and two other powders from the Wilson Combat data. Anybody using the Lee crimp die? Wasn't sure if it was worth it or not. |
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Originally Posted By TheHomelandSoldier:
Just thought I'd let the team know there's a smaller company out there offering 7.62x40 barrels, ready-to-load brass, magazine bands and loaded ammo shortly... Google "7.62x40 Products", and look about 5 listings down... Revitalizing the x40 seems to be someone's plan. View Quote White Oak Armament also produces a couple of 7.62x40 barrels. |
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What is being used for mags?
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You can get by with about any mag but I've gotten the best results with the slightly modified Lancer mags from Wilson. I have also taken Lancer and Magpul magazines and removed a little material from the front ribs myself. They run great. There are times when I think it would be great if a major ammunition company would pick up this cartridge, but then I realize that I have mine so it really doesn't matter.
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You can purchase loaded ammo through Wilson directly...but that would
not be very cost effective as the round is designed to rolled by the end user for best results and maximum cost effectiveness. With that said, It is a great wildcat cartridge for hunting with power levels equal to or slightly better than the 7.62x39mm Russian round, w/o all the hassles of the x39mm in a AR platform... The available 20" Bbl length helps to bring out its maximum potential for longer distance shots on game if needed... Good luck with yours... |
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Originally Posted By JosephTurrisi: What is being used for mags? View Quote http://shopwilsoncombat.com/mobile/AR-Style-Magazine-762x40-WT-30-Round-Polymer-Lancer-L5-AWM/productinfo/TR-762LMAG30/ D&H 300BLK mags have a shallow front rib and work excellent with 7.62x40 I got them from PSA when they had them on sale for less than $10. Not in stock right now at PSA but Wilson has them in stock. |
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Originally Posted By JosephTurrisi:
What is being used for mags? View Quote I will second the D&H mags working. I have not tried the modified lancers. I did modify a 20 round pmag. It was too much work to be worth it and it only works ok. It hasn't malfunctioned, but the stack seems like it just doesn't fit quite right. |
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Does anyone have experience with the 5r barrels? Does the different rifling help velocity or accuracy by an appreciable amount in the x40?
Can noveske barrels in x40 still be sourced? |
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Originally Posted By mxracer72:
Does anyone have experience with the 5r barrels? Does the different rifling help velocity or accuracy by an appreciable amount in the x40? Can noveske barrels in x40 still be sourced? View Quote 5R rifling tends to be quite accurate and will get you stable velocities in most calibers and generally will work with nearly all projectile types... Polygonal rifling will generally give you higher velocities with much less bore fouling, however, it tends to favor conventional projectile designs and usually does not do well with cast and monolithic projectiles... Good luck. |
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Thank you again Dr.
I have a 10.5" Bushmaster ACR converted to 300blk, which was no easy or cheap task. There was considerable machine work to do on the charging handle tray, gas block, piston, etc etc, not to mention tuning afterward for pistol gas. However, I've always had the bug to repurpose the rifle into a x40 after reading this thread about a year ago...but doing so on a piston gun is considerably more expensive than a DI gun. No additional machine work will be needed aside from cutting a factory piston down to Carbine length. The downside is that all the collective knowledge on gas port sizes goes out the window...the ACR is a notoriously "efficient" piston gun with respect to gas. Using a modified AR barrel, it consistently uses a smaller gas port than its AR brotheren (no head loss going down the tube). I'm really on the fence about this one. I have a silencer getting out of NFA jail any day which would suit 35 just fine, but I'd really like the extended range of x40. Being new to reloading I really don't want to even give myself the opportunity to mismatch 35 and 40. Decisions, decisions! Any words of advice? |
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Well on the plus side for the X40mm it is consistently accurate especially with hand loads, often
capable of 1/2 MOA to 1MOA at 100 yards with ease. The other is relatively high velocity per grain of powder, especially with the 20" Bbl version and thus the added range capability... So in effect it gives you as good or better power levels as say the 7.62x39mm Russian with better range, accuracy, and with quality .308 projectiles of your choosing... |
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So I've been looking around for a barrel to start with for my ACR. I've seen the following in the 14.5" - 16" range:
Wilson Combat (all 1:12, all Carbine gas) 14.7", mid weight
16", light weight 16" mid weight 16" mid weight fluted White Oak Armament (none 16" or shorter, all with mid gas) Noveske (no longer offered???) Can someone please confirm?
Mad Dog Weapon Systems (X-Caliber barrel) 14.5", Carbine gas, 5r, mid weight, 1:12
16", mid gas, mid weight, 1:12 Am I missing any options? Looking at what I can see currently, I'm leaning toward the MDWS 14.5 due to price and 5r rifling. However, I am unfamiliar with X-Caliber barrels. Does anyone have feedback on this? Also, is no one offering poly rifling anymore??? |
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