Jun 25, 2019 #11 Bolt action. I will have to investigation chamber. Centered on reloading brass fired in that same rifle, I resized the brass in one stroke with the press ram without the need of an excessive amount work. So, the Serbu BFG-50 should not be an outsized M2 https://50bmgreloader50powder56778.blog-ezine.com/18021894/50-bmg-reloader-50-powder-an-overview