Fiftydriver (Kirby Allen) builds the 300 AX, a 30-338 Lapua Improved cartridge with his refinements that has been around for quite some time now and proven to be very reliable in terms of high velocity, extraction, feeding and brass longevity, the 300 AX is a standout cartridge if one looks to the 338 Lapua based wildcatsVery good choice! I'm looking at the 300NMI or the 300 Lapua improved. Haven't made up my mind yet, although, the 300 terminator is in the mix as well.