I have a rifle chambered in 6BR with an 8 twist barrel. It is throated for Sierra 107 MKs which is my primary bullet. I would like to try some lighter bullets for paper punching. What Berger bullet would you recommend to try? If the 65gr BT Target would work that would be great! I'd like to try something in the 60 to 65gr range but I have concerns about the twist and throat. To give you an idea of the throat, while looking for a heavy bullet I tried some Berger 115gr Target bullets but I had to seat them really, really deep. DTAC 115's seat pretty close to the same place as the the Sierra 107's.