16" barrel

110gn -- 2400fps approx.
125gn -- 2200fps. approx.
150gn -- 2000fps. approx.

Out of a 10.5" barrel you can take approx. 200fps. off of the above, and you'll be pretty close. You'll find that most sub-sonic ammo is going to be more accurate than supers because most barrels are suited for sub-sonic ammo.. That's my experience anyway!

IMO, much better than 7.62x39.

Thanks!

It is funny you say that.  That was exactly what my original intention was.  I was just going to go with supersonic loading's for hunting.  But then I loaded up a subsonic and, well that pretty much change everything.

But in answer to your question, You will get close to 7.62x39 velocities.  Yo may be able to push it to those velocities, but you would most likley be above recommended load data

I've been loading 180gr because it's what I've had in stock from loading .308 and 30-06.  I want to move away from the 180gr in 300AAC and move towards a heavier 220gr subsonic round and a lighter, faster 110 or 135 grain bullet.  I have been and probably will continue to use H110 although I may consider other options for the subsonic rounds.  Research and time will tell.

Looking at load data, I figure I'd ask for a little input from you guys; 110 grain or 135 grain bullets?  Most of these rounds will be loaded as FMJ's for cheaper plinking rounds with a few hundred that will be defensive loads.  

Maybe going forward I'll pick up the other bullets and "do both" but I'm stopping by the LGS to compare stock and prices. Also, I've got components to pick up to start loading the wife's 45ACP - this guy only has but so much money.

I'm almost leaning towards the 110gr because they are pricing out slightly cheaper than the 135 grains but I've been known to have a hard on for heavier projectiles.  I've been looking at some of these hog photos on various forums and the 135gr seems to leave a nice wound cavity.  I've got to get rid of these 180gr's though, they are just too fast and just too slow for what I am looking for.  I love my 180gr in my .308 but it is almost worthless in my blackout...

Any thoughts or suggestions?

Thought I should add my newest lightweight subsonic 300 blackout load I developed. This is for bolt-action (non-semi-auto) 300 blk rifles only:

AAC Handi-Rifle, 300 BLK, 16.1" barrel, 5R 1:7" twist
Xtreme Bullets, 150 grain flat-point, .308", Copper Plated
5.0 grains of Alliant American Select
Winchester Small Rifle primers
2.0" OAL, taper crimp

1044 FPS average 5-shot string.

Accuracy: I haven't brought it out to 100 yards yet, but at 25 yards I was punching through staples holding up scraps of paper on the backer board ;)  It's also the most quiet load I've ever heard.

I had a few cases that looked like they had this issue.  I was having chambering problems too.  It turns out I didn't have my Hornady die set to touch the shell holder with the proper firmness. I set the die so the cases would fit the case gauge, but ended up having the shoulder to base a bit too long.  The case OAL was at max after trim, so if anything went wrong, some cases could be a few thousandths over length, and the base would not be properly sized on a few random cases.  A day at the range quickly found the out of tolerance rounds.  Some of these rounds would not fully go in the Sheridan case gauge.  Some of the defect rounds would gauge fine.

I used a sharpie on the bullet and also the case neck.  The case neck at the very end showed contact with the edge of the rifling.  A heavy crimp made some over tolerance cases chamber and fire fine.  

I pulled bullets and found that the defect cases would still not chamber.  This is when I lubed and resized and found my sizing die was not seated properly.  After resizing, I measured OAL and found some cases were a half thou to a few thou too long.  Some were more out of tolerance. Next, I adjusted my Worlds Finest trimmer to the SAAMI minimum case length.  This is also the minimum on the Wilson case gauge.  I retrimmed and then the cases chambered fine.  There was my problem.  

I next reloaded a couple 220gr HPBT Sierras that I was having the most chambering issues with.  I installed the can and fired a couple rounds into a stump.  I think I have the problem solved.  

It sucks I loaded over a hundred rounds that may have a bit too much case length.  At least they are the 125gr bullets that I had the least issues with.  I will be needing to resize and trim the entire lot after firing.  Any that won't chamber will get the same analysis.  

If Noveske had made a chamber gauge, I would have found my issues on the first setup day.

I have to add a couple more things.  Lee makes a decap only die that does not touch the outer case.  You can decap dirty cases with this and then have clean primer pockets after a tumble.  My Hornady dies says not to decap .mil brass.  This is OK with the Lee.  The Lee die is cheap on amazon.  Extra decap pins are cheap on ebay.  

I sure picked quite the caliber to start reloading rifle rounds with.  Afterward I picked up some .223 dies and went to town.  Much easier to load and the learning curve is much flatter.  I probably should have started with that.

tag

Does anybody have experience loading subs with Reloader 7? I picked some up at a LGS for this purpose but load data is scarce. I know it is not the ideal powder but good luck finding the good stuff. Rifle is a 16" Handi Rifle. No can at the moment. Thanks!

This is why 300 needs a sub forum

Off topic but slightly  relevant..
I'm sure this was mentioned before on one of the prior  1460 post in this thread.

What length of barrel are you looking at getting?

A quick search on google showed that some people have used it for loading 168gr and up. However, I have not found published data for it. I picked up a few pounds since it is next to impossible to find the ideal powders for loading subs right now. Ideally I would use it to load 168SMK, 190 and 220 Nosler CC, 208 AMAX, and maybe try out 150gr FMJ.

16

Though MI just lifted the ban on SBRs

new test subject. this SHOULD open..



224.5 gr .011 thickness jacket, 2 lead slugs, lower is WW lead and upper is pure. HP is about 3/8 deep and .120 in dia.

that will open up, of that i have no doubt.

Sierra has some RL-7 loads for 168 SMK and 165 GK  16.8-18.1 grs but the slowest velocity is 1600 fps out of a 16" barrel

I shot some 168s at close range 65' and they were extremely accurate with no pressure sign at all
when I can get to a 100 yard range I will try the 17.7 gr CCI-41 2.105" load again for true accuracy
using a good bench and Atlas bipod instead of the folding shelf and magazine rest I used Monday.

Well I guess all of them phone chats paid off.. going to try and get them into gel soon..

Unfortunately you won't find any published data from Alliant as we don't have a 300blk test barrel. Sierra has a load listed for a 168gr SMK load though.

I chrono'd each of the 4-5 load weights and my average was around 1450fps out of a DD 16" barrel on a 45 degree day. I dont have my range notebook, but none of the charge weight showed ill signs but my velocities were about 200-250fps slower than those listed by Sierra.


 

Yeah, I found that data, and over on the 300BLKTalk forum I found some loads using R-7 and 208 AMAXs. Would it be safe to work within the parameters of the 168SMK and 208 AMAX loads to develop a load for the different weight bullets? Just want to cover my bases before I venture into the unknown.

<removed> this is a Technical forum, not GD. If you disapprove of this thread, don't click on it.dryflash3



300blktalk is easier on your BP. And your sanity!

welp.. there is a bit of a problem.. when seating the bullet. it crushes the lead tip then pulls the core right out. So I have a batch of a bit longer jackets to go to the point the bullet seater touches.

Is it because of the soft lead, or is the base hitting the powder and not letting it seat all the way?

If it is because of the soft lead, have you tried belling the case mouth?

I posted this in another thread, but thought I'd add it here for some 4227 information:

I could only find IMR 4227 for my first 300 blk loads.  My first rounds through the gun were factory Gorilla 125 SMK's.  Those rounds would cycle, but not lock back on the last round.  My first reloads were 125 SMK's ranging from 16.7 - 18.6 grains.  Data was from Sierra 5, with a low of 16.2 and max of 18.7.

I could not get full function until I reached 18.2 grains of IMR 4227.  This round cycled, fed properly and locked back on empty. Accuracy seems pretty good (see below target marked 300-4 18.2).

Specs:

FC 1x 223 brass processed to 300 blk.
trim @1.359"
CAOL:  2.21"
Crimped @10lbs with a Lee FCD - consistent crimp.
Primer was CCI 41

The rifle is a 16" Wilson 1/8 SS barrel with carbine gas.  The buffer set up is a standard spring with a Spikes T2 buffer riding in a Magpul UBR extension/stock.  I'm going to lower the buffer weight to a T1 to see if it helps cycle the lower end rounds.

I also loaded some Nosler 125 BT (green tip) at varied levels from 16 - 18 grains of IMR.  Data was from Nosler.  The higher ends would cycle, but none would lock back on empty.  The rounds were loaded the same as above, but COAL was set at 2.06".  They fed fine.  18.2 will probably get these to work, but that is over the Nosler max, while still well within the Sierra max.  I'm loading some of those tonight since none of the above mentioned rounds showed any pressure signs.

Here are the targets - 25 yards with an Aimpoint ML2 non magnified red dot (in other words, don't expect one hole with this optic - all are five shot groups even though it doesn't appear that way)
Nosler 1st picture - Sierra SMK 2nd picture.

 

Here are the new 50 rounds of 300 blk test loads.

FC 223 2x converted brass
Trimmed:  1.359"
COAL:  2.21"
CCI 41
125g SMK
Crimpmed @ 15 lbs w/Lee FCD and a consistent crimp handle
(I raised the crimp just a little to see if it will get the 18g to lock back on empty)

IMR 4227

10@ 18g
20 @ 18.2g
10 @ 18.4g
[email protected]

Try it with just a regular CAR buffer

300-3 looks like a pretty good group, too.

Great advice beans!

Nice shooting.  I love IMR 4227 also.  How are you coming up with the 15 lb of crimp?  I also put a light crimp.  Can you explain your process of measuring torque?

http://www.titanreloading.com/consistent-crimp

TX desert - I used the Consistent Crimp modified torque wrench posted by shane above in my Hornady SS press with a Lee FCD.  I loaded all of the rounds with various weight charges, marked the bottom primer ring with a colored sharpie to indicate the particular load, then ran them all through the Consistent Crimp set at 15 lbs.

It is about the same as setting the Lee FCD to touch the shell plate with the ram in the up position, then turning it a half turn for light crimp, one turn for more, etc.  The consistent crimp just gives it a value and makes it easily repeatable.  So rather than referring to the crimp as a half turn past flush, it can be recorded as 10 or 15 (or more) lbs for later reference.

To the guys annealing.... how you doing it? The method of holding it and visually and feel wise of annealing with 5.56 brass doesn't work too well with 300 AAC. Gets hot FAST!

I have annealed with a socket and drill (about the same as using the Hornady product), timed with a metronome application on the iphone.  That didn't last long.  I built an annealer that works great and can do rounds as fast as it takes for the case to sit in the flame.  Here it is and here is a pan of 223 I did the other night - several hundred in about 15-20 minutes.

Here is a link to a video of it in use before I put the case feeder on.  There is another youtube video somewhere with the case feeder.  Video

 

RL-7 is slower than AA1680, use it for heavy subs only!


http://www.reloadersnest.com/query_pw.asp?CaliberID=135&Powder=Alliant Reloader 7

Are you putting tempilaq on every case? Or do you do a few to get the time down and then time it for each one?

My experience with tempilaq is it makes a mess of the brass.  I use a few pieces of trash brass with tempilaq to set the time, then run the good brass through using the established time.

Guys, I am having a hard time finding load data for Speer Bullets 200 Gr HCSP with Hodgdon H110. Anyone have any info? Thanks!

Just got some Barnes 110 tac-tx black tips in the mail.   Was going to start at 18.6 and work up.   Anyone have an h110 favorite load?

I would really like to do some subsonic 300blk loads, but I just looked at my records, and I've had Accurate 1680 on order now for more than a year.  Where are people finding it?

Are you looking for a subsonic?  if so even if you do find a load it may nit function an AR15

Hodgdon lists 9.4gr for a 208gr AMAX.

i had to find it at a Gunshow, paid more then I wanted to for it, but it was available and not at a crazy price, just higher then I would have liked,

Follow powdervalley on facebook.  They usually give a heads up on incoming Accurate shipments.  That's how I got mine.

 

I did find your answer last night by skimming all 60 pages.   Your response is Much appreciated.  I came to the conclusion I would load five at 18.4, 18.8, 19.2, 19.6 and 20.  That will give me something to start with, then I can adjust from the best groups.   Thanks again

I saw that on their website. Yes, I was hoping for subsonic. So being that the 208 gr. @ 9.4gr., I would think it would be okay to start there, being that I am using a lighter bullet?



 

Which bullets are you guys primarily using for subsonic?  I have a suppressor soon to get out of Jail.   I'd like to try some.   I've also put away two pounds of 1680.

I would not use ANY brass other than Military/LC it consistently meets same specs, others vary and are thin one one side of case necks, etc.

If you can find em the Sierra 240gr are the BOMB, or the Berger 230gr's.