Edit to add, a buddy started his AR as a sub gun, and now runs supers through a can, 115 barnes X of some type IIRC. Accurate enough, but not nearly quiet enough for my tastes.
At the point we started some of this it was all reformed brass. Then you could buy reformed, but it was still that, and with the advent of made brass, it changes things a bit.
But surplus x39 ammo for blasting is something you won't find cheap in the 300/221 hence my thinking, thats for subs, the x39 is supersonic and for blasting.
