Then again, a 1/9 twist barrel for a 77/22 and some Aguila SSS, is probably a much easier long term solution. I was mostly thinking of using these loads in more of a SWOS, silent without suppressor role, so no worries regarding baffle strikes. It also might take up more case capacity, which would MIGHT good for a lot of reasons regarding powder ignition, case to bore expansion ratio, etc. Has anyone ever experimented with turning the 75 BTHP around? They would hit harder because of more frontal area, although real world results might not be worth it.Īlso, it would move the CoP closer to the CoG, basically leaving the mostly hollow nose, now, a drag-reducing tail. And you would have a much more quiet setup on the 223 subsonic if it was functioning in the single shot straight pull operation. Even if it would, why? You would get much better terminal effect with a 300 whisper if you want subsonic semi-auto operation. The 223 subsonic would more than likely never be enough to operate a gas system. Yeah, you just answered your own question. The 300 Whisper works like this, but then again that uses more powder. I have thousands of those ready to go.Īlso, I think that a wide gas port opening in combination with a pistol length gas system and a light weight buffer/spring could allow for cycling. I'll take the advice given here from other folks and use lighter, shorter bullets. It will not have sufficient gas pressure to operate the BCG, so you'll be shooting straight pull bolt action style.ĮTA: I guess if I'd read the thread I wouldn't duplicate other's effort Since we're talking about a fast burning pistol powder here, velocity in a shorter barrel likely won't be much less. The 70 starting load would probably work well for subsonic purposes. With default settings, QuickLoad suggests that a max load of Trail Boss under a 55gr Hornady SP would be about 8.2gr at about 1900 fps. Muzzle pressure on a 20' AR is predicted at less than 2,000psi for a subsonic load. Using 4.5gr of Solo 1250, the bullet gets 1052 fps from a 24 inch barrel. Trail Boss loads, especially subsonic, are very quiet. Is there a load to make H335 send 75grs subsonic? Also, will 75gr bullets stabilize enough at that low of a velocity to prevent baffle strikes? I'll be shooting out of an 18" 1x7" twist WOA SPR barrel.ĭisclaimer: I know that any load data provided is "use at your own risk" and I know to start loading 10% less than the provided load and work my way up.Īccurate Arms lists a subsonic load with Hornady 75gr BTHP. I've read that subsonic rifle loads usually use pistol powder, and usually only around 5gr of it.ĭoes anyone know the best powder and charge for 75gr subsonics? I've got a bunch of H335 that I use for 55gr full power rounds. I'll be using bulk 75gr HPBT bullets from wideners and wolf SRM primers. 223 suppressors, which is what I'll be shooting my subs through. It does make me slightly nervous as far as squibs, but given our known velocity at 3.1 is high, I think I’ll be ok.I've searched the archives, but every thread about sub. No way I’m getting 60 fps more out of a barrel 10 inches shorter. This is why I can’t imagine the data from Hodgdon is out of a 24” barrel. We got supersonic loads from subsonic data, and I’m shooting a 14.5” barrel. Gun didn’t even begin to cycle as expected. I was shocked at how relatively good the SD was given the case fill. The speed of sound given my environmental factors is 1,106. Now, the interesting part: these clearly were not subsonic. Accuracy was surprisingly good at about an inch. I shot three at 25 yards without a suppressor to make sure they were flying straight and I wouldn’t get a baffle strike. The specific subsonic loads document does not list barrel length. They say it’s out of a 24” barrel, but I’m thinking that’s a generic number for the rifle data and is not accurate for this load. This is published load data on Hodgdon’s website. Quick info: 3.1 gr Titegroup under 55 gr FMJ 2.200” OAL. There were enough people wanting an update on my post yesterday that I wanted to give a follow-up and results. If you’re interested in using reddit for self-promotion check out our Official Spam Policy. Other Subreddits you may be interested in: This unfortunately includes reloading components like brass, and projectiles. Due to reddit policies all posts selling, trading, or buying ammunition are forbidden. If you'd like to post reloading equipment for sale, for trade, or a request for something you'd like to buy please put, , or respectively, at the beginning of your title. R/Reloading discord join us for supplies and helpful conversation: Https://discord.gg/reloading Posts titled " Help! New Reloader." will have less responses than a post titled like "Questions about crimp for. Please make sure you title is relevant to the specific question you are asking. Remember, if you post a picture, make sure to provides some context.
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