Dedicated subsonic bolt gun

[Evil_Ed]

I did...for reasons

ARC Nucleus action, Preferred Barrels 9" 300blk 1/7" cut with a Sig taper, Dead Air Nomad-30, JTAC Screech Owl chassis, PMM "Kate Moss" stock, and an old Tasco Super Sniper 10x on top because that's the only optic I had laying around that wasn't spoken for

I wound up putting a Dead Air Xeno brake on it rather than just use the Sig taper; I've got more things with Xeno than are cut with Sig tapers so it makes moving things around easier. It's pretty much giggle-quiet with subs.

 

[st1650]

I did...for reasons

ARC Nucleus action, Preferred Barrels 9" 300blk 1/7" cut with a Sig taper, Dead Air Nomad-30, JTAC Screech Owl chassis, PMM "Kate Moss" stock, and an old Tasco Super Sniper 10x on top because that's the only optic I had laying around that wasn't spoken for

I wound up putting a Dead Air Xeno brake on it rather than just use the Sig taper; I've got more things with Xeno than are cut with Sig tapers so it makes moving things around easier. It's pretty much giggle-quiet with subs.

Any issues feedings from the PMAG AICS 223 mags ?

 

[FuhQ]

Any issues feedings from the PMAG AICS 223 mags ?

I run these in my Ruger American Ranch that I put a standard Ruger Short-action Magpul Hunter stock (AICS) on, instead of the STANAG stock, and they feed perfectly. They also have a much longer internal length, so you can load up into/near the lands, instead of being limited by the AR magazine's internal length.

 

[st1650]

I run these in my Ruger American Ranch that I put a standard Ruger Short-action Magpul Hunter stock (AICS) on, instead of the STANAG stock, and they feed perfectly. They also have a much longer internal length, so you can load up into/near the lands, instead of being limited by the AR magazine's internal length.

Interesting. Magpul says they don't work great on the R700 action feeding 300blk. Maybe the Ruger action/bolt face is better than the 2lug R700.
I've also heard the Howa mini actions feed these good.

 

[Evil_Ed]

Any issues feedings from the PMAG AICS 223 mags ?

Not for me, no - I've tried a couple mags, I like the MDT ones the best with the Magpuls coming in second...the Ruger ones don't fit my chassis/action combo. They sit too low; it's probably adjustable, or I could just not buy those mags, so that's what I'm gonna do.

 

[JaredC]

What about a 375 raptor? 1-8 twist and the 400 grain subs are an absolute hammer. It’s repurposed 308 brass and you can still load supersonic rounds also. I have one myself and enjoy it

 

[45-90]

Most of my sub sonic rounds have been geared toward auto loaders. Did quite alot with standard 308 Win subs, in bolts with 12, 11.25,10, 9, 8 twists.. with barrels from 16" to 30" for fun plinking and its pretty accurate, with 175 gr SMK stable in slower twist.
The standard 50BMG bolt is totally fun with subs, and fairly cheap with the military bullets and capable of good accuracy, with the 650 gr which will stablize in the standard 15 twist.
Many of the discussed cartridges here will work, which my work better depends on the use and what is expected of it. I like the AR 15 16" 14 twist barreled 450 bushmaster with 502 gr GC cast for close range economical power, and fast follow up shots. If the range was extended the 8.6 Blackout has a range advantage but not an energy advantage as the 450 can shoot much heavier and has larger diameter.
I am still waiting on the fast twist 510 barrel to be delivered along with a slower twist 8.6, 6.5 twist to replace the 3 twist. The 510 will be chambered for the 510 whisper, already have the reamer, action, etc. Going big on this particular build.