I have a Mausingfield short action and a Manners carbon fiber stock I’d like to use for a long range hunting build with a carbon fiber barrel. The bottom is cut for M5 bottom metal. What mags or bottom metal could I use to help seat bullets out longer if going with the 30ss, I’d like to use 215’s. What would be real world attainable velocities with each,7mm 180’s vs 215’s? I have plenty of Re26 and H1000. I’d like to keep the barrel length at 24”.