Just got back from trying TrailBoss propellant for subsonic loads.

What a hoot!

Following the reloading manual, 460 grain cast projectile with 19 grains of Trail Boss yields between 900 and 1000 fps.

Accuracy was excellent. 1" and 50 yards. Recoil was non-existent. Sounded like a 22 long rifle.

Hmmm, now where is that sniper scope?

***** WARNING *****

For those who may want to try this, cast bullets ONLY. Jacketed bullet can get stuck.