I'm trying to load the MP 311-410 HP pc'd for my 300 BO AR-15. I am having cycling issues with this lighter weight bullet. I have worked up to max with IMR-4227 and the round fires and ejects but the bolt closes on the next round being fed and jams it up.
I have several other Hodgdon and IMR powders, but should I look to a faster or slower burning powder?
Any other tips or suggestions? I really want this cast boolit to work! I load an NOE 230 grain boolit with 4227 and it works great, but I need a lighter, and flatter, HP for quick action coyote/bobcats around the farm.