I can see how the Lazyroni cartridges get their speed........load em with specially lubed bullets ie. nP3 from robar and run them at extreme pressures. I looked at the warbird reloading data and the loads run from 66,000 t0 67,000+ psi at a mild 70 degrees.......[]wonder what the pressures would be at 100 degrees?[]. Are these cartridges listed with SAAMI and have their approval?

doubleA