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Message: <blockquote data-quote="Larry Morgan" data-source="post: 2930208" data-attributes="member: 4676">69gr with 1:9 is going to start depending a lot on what velocity you achieve out the barrel. It's about spin speed vs bullet length. If the bullet length goes up, so must spin speed. To get spin speed up, you have to push the bullet harder to up velocity, or make the twist rate faster. 69gr SMK is probably your best bet. It took me awhile before I could get 68gr HPBT from Hornady to straighten out in 1:9 because it's noticeably longer than the SMK. I have to push them near max, which means 2800+fps out of a 24" barrel and 30gr of RL-15.</blockquote>