JDBenelliM1 Posted November 3, 2015 Report Share Posted November 3, 2015 I'm thinking about changing the barrel on my TRG to a short, fast twist 1 in 8 as I'd really like to run subsonic loads as well as heavier super sonic bullets. Does anyone run a fast twist .308? Any advice welcome pros/cons I would like to shoot sub 2" groups at 200y with subs...am I going to be disappointed?! Link to comment Share on other sites More sharing options...
MrCetrizine Posted November 3, 2015 Report Share Posted November 3, 2015 I'm not exactly sure about .308 but sub 2" at 200yd with a Blackout loaded with 210gn SMK at 1050fps (or at least mine) doesn't happen. That's with a 12 inch 1:7 barrel. It's more like 5", 4" on a really good day. Link to comment Share on other sites More sharing options...
JDBenelliM1 Posted November 3, 2015 Author Report Share Posted November 3, 2015 I have no idea what's realistic with subs. Ive had a great 4 weeks shooting vermin around our poultry sheds with the .243 as the flock was out. Now the new hens are in I'm very frustrated as there's still a lot of shooting to do. The ground is open with very little cover and it's just pushing the .22lr a bit far. Link to comment Share on other sites More sharing options...
phaedra1106uk Posted November 3, 2015 Report Share Posted November 3, 2015 Single 1/2" raggy hole grouping at 25m with a .308 Steyr SSG-04 using 4.9gr of Viht N310, a 115gr "Soupcan" cast boolit at 980fps. Same with the 300aac Blackout Handi Rifle using the same boolit with 3.7gr or the 165gr RNFP from Shell House Bullets and 3.4gr. I tried some 168gr Nosler Custom Competition at 100yds using 9gr of TrailBoss but they wouldn't stabilise. Link to comment Share on other sites More sharing options...
terryh Posted November 4, 2015 Report Share Posted November 4, 2015 JDB, If you are dead set on running a sub sonic 308 give Steve Bowers a call. A couple of years back I was at his place and in conversation subs came up. He showed me a rifle he had built for a customer and accuracy results. The 100 yard accuracy was two rows of small gorups spaced about 6-7" difference between the top row ('normal' 308 loads) and the bottom (sub-sonic). From memory the two bullets involved were 125g BT's and the 210g Lapua sub sonic bullets. The secret in the subsonic accuracy was making sure the cases were batched and picking a powder that is not sensative to being loose in the case. Re. twist rate, do not think the normal rules apply, but talk to Steve. Brgds Terry Link to comment Share on other sites More sharing options...
The_Dogge Posted November 4, 2015 Report Share Posted November 4, 2015 I've not done it, so know nothing about the accuracy potential, but apparently you can get a subsonic load out of a .243 with Trail Boss: https://www.hodgdon.com/PDF/Trail-Boss-Reduced-Loads%20R_P.pdf Or your current .308 of course. Why not give it a go as it is for a low cost try out? I presume the chance of ricochet is higher with any subsonic loading, and we are talking about quite heavy bullets, that could put me off a bit. Link to comment Share on other sites More sharing options...
Hatzi Posted November 4, 2015 Report Share Posted November 4, 2015 Yes its no great bother with trailboss but poor expansion and ricochet need careful consideration. I use 30-30 flat nose 150's in mine, nice and short with thin jackets. Thats a standard 308 with a 12" twist. If you Plan to go long range with heavies you need a faster twist Link to comment Share on other sites More sharing options...
tackb Posted November 4, 2015 Report Share Posted November 4, 2015 I use 180g fbrn over trailboss , about 1.5'' at 100m and 4-5'' at 200m , drop is an issue ! Link to comment Share on other sites More sharing options...
David Hancock Posted November 4, 2015 Report Share Posted November 4, 2015 +1 Steve Bowers and, think Bruce Potts. Google the net for an article on a sub .308 Link to comment Share on other sites More sharing options...
bradders Posted November 4, 2015 Report Share Posted November 4, 2015 You'd only really need a 1:8 if shooting 240 SMKs or similar. If you were t shoot 220s or Lapuas 200n subsonic bullet, you could get away with a 1:10 A couple of years ago I ended up with a barrel and suppressor from Steve Bowers that he'd done for Bruce Potts and one of his friends that was in a .338 that was necked up from 6BR. Quite a little round, and I had several chats with Steve about building it, which I did on a trued Remington action By all accounts it was both very quiet and very accurate The new owner was certainly happy I believe the secret to getting good performance out of a subsonic .308 is to use some kind of filler Link to comment Share on other sites More sharing options...
dodgyrog Posted November 4, 2015 Report Share Posted November 4, 2015 Sounds like you need a 300 Whisper not a .308! Link to comment Share on other sites More sharing options...
JDBenelliM1 Posted November 4, 2015 Author Report Share Posted November 4, 2015 I was thinking about a 300 whisper/blackout upper for my AR but the TRG isn't getting used as much as I'd like so thought about turning it into a dual purpose rifle. Its a 1 in 13 twist ATM so don't think I'll have much success with it as it is. I'll give Steve a call to see what the best route would be. Link to comment Share on other sites More sharing options...
JDBenelliM1 Posted November 4, 2015 Author Report Share Posted November 4, 2015 You'd only really need a 1:8 if shooting 240 SMKs or similar. If you were t shoot 220s or Lapuas 200n subsonic bullet, you could get away with a 1:10 A couple of years ago I ended up with a barrel and suppressor from Steve Bowers that he'd done for Bruce Potts and one of his friends that was in a .338 that was necked up from 6BR. Quite a little round, and I had several chats with Steve about building it, which I did on a trued Remington action By all accounts it was both very quiet and very accurate The new owner was certainly happy I believe the secret to getting good performance out of a subsonic .308 is to use some kind of filler Looks like a fun tool. Bet it would send magpies arse over tit Link to comment Share on other sites More sharing options...
terryh Posted November 5, 2015 Report Share Posted November 5, 2015 Sounds like you need a 300 Whisper not a .308! But you then cannot (legally!) shoot deer when the cartridge is wound up again to sonic speeds? T Link to comment Share on other sites More sharing options...
terryh Posted November 5, 2015 Report Share Posted November 5, 2015 Sounds like you need a 300 Whisper not a .308! But you then cannot use the 308 in the TRG to it's full potential or (legally!) shoot deer when the cartridge is wound up again to sonic speeds? T Link to comment Share on other sites More sharing options...
JDBenelliM1 Posted November 5, 2015 Author Report Share Posted November 5, 2015 Spoke to Steve today. I have a plan! Thanks terry and bradders for the heads up. Link to comment Share on other sites More sharing options...
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