Nah, it won't,,, it's funny the 243 knocked the 250 savage off its popularity, now the creedmoors are popular, which based on 6xc (which was based on 22-250, from 250 savage).. see what i'm getting at,, "circle of cartridge life"! I built a 250 savage because my "xc" was so great (before creedmoor's became a named cartridge which came of age because of Tubbs 6xc). I also built a 6.5 xc. but there are too many .243's, & 06's, & .270's around for them to be obsolete.. your right, though, the 30 degree shouldered rounds are a bit more accurate on paper, but for practical purposes, (hunting) diff is absolutely in the eye of the beholder. In psychology, its called novelty. keeps one interested in an activity, shooting in this instance. sorry for being so "wordy"