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Posted: 7/12/2014 8:53:12 PM EDT
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Does anyone have any experience loading .308 subs? I have searched it pretty hard and I have only found a recipe for 10-11 grains of trail boss behind a heavy bullet. I could do that, but trail boss isn't available anywhere as far as I can tell.
Does anyone have any loads for .308 subs with powder that is actually available? ETA: These loads will be going through a Savage Hog Hunter, 20" barrel, 1-10 twist. There will be an AAC Cyclone on it once it gets approved. I am hoping it will stabilize the 200 grain Lapua subsonic projectiles. |
@ cvtrpr: I have the same rifle, 208's stable in the 10 twist? I have some loaded for my 300BLK, but under the impression they aren't stabilized in this twist. Just picked up my Elite Iron can yesterday and ready to play. Do you have any chrony data for your load? Thanks for your input 
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Remington 700 PSS cut to 20” (1/12) SAS Suppressor (.308 SS) Case: Lapua (virgin brass-no flash hole enlargement) Primer: CCI BR-2 Powder: RedDot (8.3g) Bullet: SMK BTHP 175 Loaded to 2.775” OAL Test conditions: -86F -73.3% Humidity -29.99in/HG Results: 1026.6 FPS I have 220g RN I can try to work up a load for. Will post back when I get time to try it. I generally fire a full power load first to get the sounds difference on video. The videos are photo bucket, so you have to click to watch. |
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Quoted: @ cvtrpr: I have the same rifle, 208's stable in the 10 twist? I have some loaded for my 300BLK, but under the impression they aren't stabilized in this twist. Just picked up my Elite Iron can yesterday and ready to play. Do you have any chrony data for your load? Thanks for your input  |
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Quoted: This is my best group with that load....No stability issues detected. No chrono data, but I can grab some this weekend. I'll get back to you. http://i1112.photobucket.com/albums/k499/arfcomcvtrpr/photo_zps2a66d81d.jpg Quoted: Quoted: @ cvtrpr: I have the same rifle, 208's stable in the 10 twist? I have some loaded for my 300BLK, but under the impression they aren't stabilized in this twist. Just picked up my Elite Iron can yesterday and ready to play. Do you have any chrony data for your load? Thanks for your input http://i1112.photobucket.com/albums/k499/arfcomcvtrpr/photo_zps2a66d81d.jpg |
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Quoted: Thanks for the reply, I shot some 208's in the BLK and will load some up for the .308. My stability concern is in regard to sub loads, so I'll try some supersonic as well. The subs in my 300 BLK were so far pretty lousy. More work to do there. |
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Quoted:
This is my best group with that load....No stability issues detected. No chrono data, but I can grab some this weekend. I'll get back to you. <a href="http://s1112.photobucket.com/user/arfcomcvtrpr/media/photo_zps2a66d81d.jpg.html" target="_blank">http://i1112.photobucket.com/albums/k499/arfcomcvtrpr/photo_zps2a66d81d.jpg</a> Quoted:
Quoted:
@ cvtrpr: I have the same rifle, 208's stable in the 10 twist? I have some loaded for my 300BLK, but under the impression they aren't stabilized in this twist. Just picked up my Elite Iron can yesterday and ready to play. Do you have any chrony data for your load? Thanks for your input <a href="http://s1112.photobucket.com/user/arfcomcvtrpr/media/photo_zps2a66d81d.jpg.html" target="_blank">http://i1112.photobucket.com/albums/k499/arfcomcvtrpr/photo_zps2a66d81d.jpg</a> Dude....at least three of the bullets in that group are tipping which indicates they're not fully stabilized. Look at the top three bullet holes in that vertical string, see how they're a smidge oval in shape? See how the tiny hole in the paper cut by the tip of the bullet is off center as it relates to the grey smudge the bullet left on the paper? I have a 6.5 Swede that does this very thing with Hornady 160 gr. RN's. No bog deal really as I've grouped then out to 200 meters and they still group fine. |
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You can use just about any fast burning handgun/shotgun powder. I firelapped the barrel on one of my .308's a couple of years ago using 190 gr. Hornady SPBT's. As I recall I used about 5.0 grs of Red Dot as the goal is to run the bullets as slow as possible and still have them exit the barrel.
I shot at least a couple thousand subsonic cast loads through one of my Swiss K-31's. I used 8.0 gr. of Red Dot and 6.7 gr. of Bullseye with the 155 gr. bullet if that helps. |
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I shot some test loads today in my 308 Sig Sauer SSG 3000 with the 18" bbl a and Kestrel 308.
175gr match kings Winchester brass, I did nothing to the flash holes. Winchester LRP Trail boss. COAL was right at 2.810" Starting at 11.5gr I worked down in half grain jumps. Best results were with 10.0gr. I ordered a Magneto Speed and it did not get here before we left for the range this morning. It was sitting on the porch when we got back though. |
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Quoted:
Interested. Also was going to tell you 10ring.com had a shelf full of trail boss earlier this week with no limit! Thanks for the heads up on 10ring. If they are willing to ship powder, they certainly don't make it evident on their website. The 200 grain Lapuas were subsonic. That being said I had one bullet that may not have stabilized. I was using an old, nasty, round bale of hay for a target backer and I am not sure if that made it look like it cam into the target sideways or if it actually was tumbling. I'm going to try and make it to the range today to see if I get the same results with an actual target backer. |
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Quoted: Both my .308s are 1:10 twist, what range of bullet weights to stay within? I have some trail boss to use. I also understand that for subs, boattails are not good to use, but flat bottom? Not knocking you, but this is one of my pet peeves. People have no idea if it will work, but because they heard it on the interwebs, it must be true.
 Bottom line is you need to try the combo/recipe in your equipment to see if it will work or not. When I worked up sub loads years ago, everyone told me that the SMKs would not work for subsonic loadings. Not that they would not be ideal, but flat out they wouldn't work. I saw of at least two of us in this thread that used SMKs. The old wisdom was to load the SMKs backwards for sub-loadings.  |
| I am new to reloading and that is why I am asking. That and I bought some 175in SMKs loaded to try in a suppressed 308 and got a baffle strike on the second or third shot. I should have tested them out first but did not for stabilization. I have not tried the rest withoit a suppressor. They were subs. So just wanting to get the benefit of the experienced people here. |
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Quoted:
I am new to reloading and that is why I am asking. That and I bought some 175in SMKs loaded to try in a suppressed 308 and got a baffle strike on the second or third shot. I should have tested them out first but did not for stabilization. I have not tried the rest withoit a suppressor. They were subs. So just wanting to get the benefit of the experienced people here. What velocity were those 175 SMKs moving at? How much of what kind of powder were you using? |
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Quoted:
I found some trail boss. I loaded the 200gr Lapua FMJBT sub projos over 11 grains of trail boss in new Lapua brass with CCI BR-2 primers. I will update if anyone is interested. I averaged 997 fps with 10.0 gr of Trail Boss and the 200 gr Lapua subsonic bullets. This was out of a 20" AR-10. Rem 9 1/2 large rifle magnum primers. I did drill out the flash holes a bit. |
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Actually there is probably nothing wrong with the ammo. It is just slightly heavy subsonic and you are shooting it in a 1:10 twist barrel. Suppressed 30 cal is usually a 1:8 twist. At the moment my machine with ballistic software is down but from memory I think you need a 150 or less for a 1:10.
*edited the above after trying another ballistic program I have that uses a modified Greenhill twist rate formula. It indicates a 1:10 is good for 150gr or less at subsonic velocity. Not the weight of the bullet but the longer length that may require a faster twist so bullet design and composition make a difference also. |
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I couldn't get 208gr HPBT to stabilize like I wanted them to from my 1/10 twist Savage. My barrel is cut back to 14.5", so that may or may not have had something to do with it. I never was satisfied with how they were flying so I loaded them all for my 1/8 twist 300 Blackout. I had some Nosler Custom Comp 175s and decided to give them a shot. I don't have all of the numbers in front of me, by it ended up averaging in the mid 1020FPS range.
Savage Precision Carbine, 1/10 twist, 14.5" barrel 175gr Nosler Custom Comp HPBT 9.2gr Trail Boss CCI 200 primers Brass trimmed to 2.015" 2.89" OAL |
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I didn't see it mentioned in this thread, but have seen it elsewhere on the web so I'll ask those that have been gracious enough to post their experiences already: do you guys enlarge the flash hole on the .308 brass when you're running subs? Like I said, I've seen posts elsewhere which indicate some people do in order to get consistent ignition, but didn't see it in this thread.
Thanks Eric |
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I tried the flash hole enlarging, mostly because I didnt want to use magnum primers.
At the same time, I ran a batch with an untouched hole. I saw no difference. 11gr of Trailboss is not a small charge and fits in the case nicely. Ive yet to try any fillers, but I could see them helping with a standard flash hole. Its easy enough to do the hole so experiment and try a couple. |
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Quoted:
I didn't see it mentioned in this thread, but have seen it elsewhere on the web so I'll ask those that have been gracious enough to post their experiences already: do you guys enlarge the flash hole on the .308 brass when you're running subs? Like I said, I've seen posts elsewhere which indicate some people do in order to get consistent ignition, but didn't see it in this thread. Thanks Eric I have shot 140 sub loads in my 308 so far and have not done anything to the flash holes on Winchester brass except deburr the inside of them. I use 10.0 grains ( 18 inch barrel ) of Trail Boss and it takes up about 60/65% of the case. I am guessing on this because I have not filled a case to get a full case weight. |
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190gr SMK (pulls from RMR)
7.7GR TITEGROUP NATO BRASS. Remmy AAC SDS 20"BBL 1/10 groups 1.5" at 100yds with no wind and good solid bags. runs about 1000 fp in winter. I seat them mag length with a very slight crimp. Farther off the lands i go, bigger the groups. No pressure signs. Primers are slightly domed but thats expected With such a small pressure load. Shot 100rds yesterday, very quiet even with a 45acp pistol can. |
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Quoted:
I calculated 22% case volume with 7.7 of TiteGroup. You say you get very good results? Any filler used? Quoted:
Quoted:
190gr SMK (pulls from RMR) 7.7GR TITEGROUP NATO BRASS. I calculated 22% case volume with 7.7 of TiteGroup. You say you get very good results? Any filler used? No filler. Titegroup is not sensitive to position. Its the best sub load i've found and i've tried quite a few. ETA: the vertical stringing may be lessened with a flat base bullet. The boattail allows the fine grains of powder To get in the nooks and crannies. Makes sense that powder closer to the flash would burn better. |
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