I'm shooting a 7-300 wsm with an improved shoulder, its no faster than the 7 wsm but the 45 degree shoulder only requires trimming after 15 shots.New light weight build on a Terminus Apollo lite short action with 3.0 COAL? Which short mag? Thinking about 7mm-300wsm or 7 ss. 180 -190gr. bullets. 22" or 24"barrel? Carbon or Steel barrel?