Thanks. This excites me. Built a few 300prc, may have to get a 7prc and have an experiment to get some data. Would be nice with 180gr Berger @ 300 zillion fps.7lrm has quite a bit more taper and a longer neck. The 7lrm has 87gr powder capacity, whereas the 7-300prc is closer to 94. The prc will still have a 300" long neck.