Thread: Subsonic load for 308

My tikka barrelled sako 75 uses 8.3 gr of trailboss for the 151grs and 8.5gr for the 165gr ballistic tips

I'd guess 9.5 gr for the projectiles you mentioned, start higher and work down
Make sure the holes in the target are round before screwing on the suppressor

Originally Posted by Bill999

My tikka barrelled sako 75 uses 8.3 gr of trailboss for the 151grs and 8.5gr for the 165gr ballistic tips

I'd guess 9.5 gr for the projectiles you mentioned, start higher and work down
Make sure the holes in the target are round before screwing on the suppressor

I think mine is 8.5gr for the 150gr which gives 1030fps.
Haven't chronographed the 174gr ones yet

10.2gns of TrailBoss do it in my 16" 308 with 200gn Lapua pills.

Stupid question... take the can off and shoot subs through but leave your scope where it is? Then just see how the subs group? Change powder levels till your grouping well and below sound barrier?

You will have a big elevation difference between subs and supers. My supers are sighted dead on at 100yds. I need 6MOA elevation to get subs to zero at 25yds.

Originally Posted by G.I_Joel

Stupid question... take the can off and shoot subs through but leave your scope where it is? Then just see how the subs group? Change powder levels till your grouping well and below sound barrier?

No you take the suppressor off and test to see the projectiles dont tumble. If they tumble they could hit the suppressor and damage it.
Once they shoot straight and dont tumble, then put suppressor on and carry on

Originally Posted by stug

You will have a big elevation difference between subs and supers. My supers are sighted dead on at 100yds. I need 6MOA elevation to get subs to zero at 25yds.

4.5 MOA difference for me between supers at 200m and subs at 50m

I'm hoping for mine to be a dedicated subsonic rifle.
And supersonic as a secondary option

I will have a 260AI and a 6.5 creedmore for any hunting requiring higher velocities

Did you see this? a series of 3 vids...interesting. (hope it's the right one.)

https://www.youtube.com/watch?v=DB1DpwMth98

Originally Posted by jim160

@aetchell I will give you a start point with mine, but your barrel length and wear will show different speeds.
Most factory subsonic loads were for the short barrels on ar15s and were supersonic in longer barrelled rifles.

But will let you know. I think the powder used is 2205.

Cool, thanks. Ive got a 16" barrel on the howa mini action.

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Originally Posted by stug

You will have a big elevation difference between subs and supers. My supers are sighted dead on at 100yds. I need 6MOA elevation to get subs to zero at 25yds.

Yep. Same here. Zero for 168gr at 100, 8moa for subs at 25

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Has anyone tried using 2205 for subsonic loads with the 208gr projectiles in 308.
Trail boss didnt work so I might try 2205 cause it worked in the 300blkout

Originally Posted by jim160

Has anyone tried using 2205 for subsonic loads with the 208gr projectiles in 308.
Trail boss didnt work so I might try 2205 cause it worked in the 300blkout

I've tried 2205 in 308 with 220gr RN's, and in 7.62x39 with 180gr RN's (bad bullet choice btw).

It works reasonably well. I got more consistent velocities than with trail boss. On the other hand, it's a lot slower burning than train boss - pressure is so low that cases don't seal the chamber, and there's more pressure at the muzzle meaning it's a fair bit louder.

Has anyone tried the Winchester super x subsonic loads?

Nah I don’t reload - maybe later I will, so the factory rounds appeal, if they work - I use a 300 BLK at the moment with supers and subs