hmmmm Still have this same barrel stub but have not yet chambered it. decided the inside reaming was too big a pain to mess with and have not decided on the exact chamber reamer to have cut. I would assume that the twist is going to be dependant on the bullet chosen, but for most of the bullets available it wont have to be that fast. (38special shoots 158's subsonic all the time) I have recently played with opening the 223 WSSM up to 357, and man what a slick cartridge that makes! it also fits in the AR mag and with a barrel extension installed on the upper but no barrel ( as I dont have one chambered) if feeds them too! Oh and I used a douglas PISTOL blank with a 1:10 twist.
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