I was able to take it to 400M (450yards) with my new Helos Gen 2-12 and was doing 100% hit rate on a 10in plate at 400M (19.4 mils) and 100% hit rate on a 6in plate at 300M (13.3 mils). I've been using Rem 7 1/2 primers and had better results although I'll be SOL once I run out since I usually can't get the CCI 450s and BR4s to ignite 100% of the time. Haven't had a sticky bolt or a blown primer but definitely this is the kind of load that you work up slowly and use a chrono. I won't post the load data because according to quickload, with the Amax 208, I'm in the 60K psi territory. I've been trying VV Tinstar, N105, N110, N120 and all of the usual suspects and I was doing okay with 7.3-7.5 N105 but nothing can could even match my 308win accuracy and SDs and lo and behold, I decided to work up a ladder with N330 and it's absolutely incredible. It took me a long time to find the right powder that had the case fill %, burn rate and the consistency for accurate long range and I was able to finally test it this week and I was impressed at the results. I bough the barrel as a prefit but I think I'll get my smith to add a bit of a chamfer to the barrel since it's a little picky feeding the 190 SubX (the 208 amax and Lapuas are fine). I'd still would like to get rid of the Gempro but the higher end scale are just so expensive, I can't justify it since I can make it work with what I have now.įor subsonic 300BLK, I use a Defiance anTI with a Bartlein 1:8 barrel at 12.5in. I use a rechargeable battery pack for both my Chargemaster and my Gempro in order because when I would use the AC power adapter I would get drift. Consistent neck tension and a scale that can do better than the +/. My Lapua FMJBT can do 1/2-3/4 moa but the name of the game in subsonic is to have single digit sd/es otherwise you'll get a lot of vertical past 100 yards. My golden load is Lapua brass, Fed Large Match primers, Redding match bushing dies, 11gr Trailboss, Lapua 200FMJ-BT but Hornady 190 Sub-X and Amax 208 are good substitutes, they're not picky on seating depth and will do 3/4 moa at 100 yards or better. I can't speak for the 350 legend but I have a quite a bit of experience in both sub 300BLK bolt and my 308Win DTA is a dedicated subsonic rifle.Īctually for the longest time, the DTA would outshoot the 300BLK, I could never get the 300BLK to have single digit SDs the way I was doing it for 308win.įor the 308 win, I'm using the older DTA 1:8 twist 16in barrel. Yes a heavy 375/44/450 caliber bullet is louder but it will do a better job of killing an animal cleanly than a 300 blackout will IMO Yes the blackout will work at close range with the correct (expensive) expanding bullets but there are better mouse traps for the job. If my intent is to kill something with Subs out of a bolt gun I want more bullet mass than a blackout can provide. If and when I get the urge to try another bolt gun in 300 blackout I'll probably just put a switchblock on an AR so to kill the gas so it becomes a straight pull. I've had a couple blackout bolt guns and the idea seems fun but the reality is that i just never use them and always end up back at the AR pistol platform with 10.5" barrel for 300 Blackout usage. Stock selection is limited but there are a few out there. It shoots probably as well as the Subsonic blackouts are capable of, which isn't all that fantastic but ok. I know some have gotten it to work but I think you need to modify the mags. I've never had much luck with 300 Blackout in AICS magazines. In my mind it makes more sense than building a R700 that you have to feed via Floorplate. Gives you a chance to play with the BO platform in a rifle without dumping a bunch of cash in it. Unless you want to throw a bunch of money at it just pick up the Ruger American Ranch that takes the AR Mags.
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