Hello, I am new to reloading. I bought a Remington 700 .308 tactical, it has a 1:10 twist, while at the gun store I found some 30 cal 240 gr slugs, I have a suppressor and was figuring on loading a subsonic load and that the heavier the bullet the easier to get it subsonic. The problem is I cannot find load data for this weight anywhere. I even wrote sierra the bullet manufacturer asking for load data and they told me they don't have any. So did I waste my money on these or does someone have some load data for me?
- Thread starter zigster80
- Start date
tightgroup works. I used 8 grains with a 170gr round nose. I have seen others using trailboss.
You are very likely going to have trouble stabilizing the 240's in a 1:10 twist barrel. you had better find your load and try about 50 rounds at different distances before screwing on the suppressor. If they are key holing, don't use them with a suppressor. are they match type bullets or round nose? the round nose ones will typically stabilize better than the match bullets.
You are very likely going to have trouble stabilizing the 240's in a 1:10 twist barrel. you had better find your load and try about 50 rounds at different distances before screwing on the suppressor. If they are key holing, don't use them with a suppressor. are they match type bullets or round nose? the round nose ones will typically stabilize better than the match bullets.
Do you for see any problems with the 1-8 twist barrel I'm using? I'm using 240 grain smk and a thunderbeast 30ba. I could also try to pick up some 220 grain round nose if you think it would be a problem. I'll still check for keyholing though obviously
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I have a 1:7 and a 1:8 twist blackout barrel. They both stabilize a 220 SMK at 1050 fps. I have not tried the 240's, but I am pretty confident they would work in a 1:8.
--Daniel
--Daniel
Two things I've learned with making my own subsonic loads:
1. Do your load dev backwards, starting with high charges and moving downwards (a chronograph is a big help here too)
2. Do your tests without the suppressor first to make sure you're getting good bullet stabilization and no keyholes.
1. Do your load dev backwards, starting with high charges and moving downwards (a chronograph is a big help here too)
2. Do your tests without the suppressor first to make sure you're getting good bullet stabilization and no keyholes.
Dogtown is 100% right on this. Make sure your bullets are flying straight before you put a can on. Don't shoot 240s in the 10 twist barrel and I wouldn't shoot the 220s in that twist either unless you're shooting supersonic. I make and repair suppressors as part of my work and I have repaired a lot of cans that were damaged by guys trying to load bullets that were too long for twists that were too slow. You need at least 1-8 to shoot the 220s reliably subsonic and that as a minimum for the 240s. Shooting subsonic through the 308 is really a waste in any case. Build a 30-221, 300 fireball, or 300 blackout to use those bullets subsonic. You can also shoot lighter stuff pretty fast so the rounds are very versatile. Using the 308 means you're stuck using less than optimum powders like trailboss and wasting a lot of powder space. Your long range rifle isn't really setup for subs either. I shoot or shot a lot of 30-221 which is basically the equivalent of the 300 whisper and was able to shoot 125gr soft points at 30/30 velocity while still being able to shoot the 240gr matchkings very accurately subsonic and quiet.
Good luck
Frank
Good luck
Frank
Im still so lost in this subsonic subject..
I ran through different powders, seating depths and crimps to get the 240 SMK to shoot this well and have low extreme spreads. This load is actually slightly compressed which I feel helps with it's consistency. The winner came out the be IMR-4198 though other powders used were AA1680 and AA5477.
This load is running subsonic (1030fps avg.) in my 1:7 16.5" M700 Blackout. You can see the bullet's flight fairly well at 100yd targets and very well at 200yds. It's trajectory is like a rock and neat to watch but is quiet. You can see the holes that are nice and round which is a good thing!
This load is running subsonic (1030fps avg.) in my 1:7 16.5" M700 Blackout. You can see the bullet's flight fairly well at 100yd targets and very well at 200yds. It's trajectory is like a rock and neat to watch but is quiet. You can see the holes that are nice and round which is a good thing!
