Looks like I got a short chamber

[diddlyv]

Not sure if close to rifling is always necessary my Rem 40XBR shoots about 1/2 min with 190, 180 175 and 155 SMKs the 190s don't touch the rifling and the 155s sure as heck dont get anywhere near close. Generally seat everything so the base is close to the base of the neck so the 190s have a whole lot of bullet sticking out the 155s not so much. Guessing the chamber has a pretty long lead but really close to .308 in diameter so the bullets dont get much of a chance to go anywhere but straight.