As for the "why" the OP asked for....purely guesswork....the round doesn't get as large of a ballistics improvement from a longer barrel because its comparatively slower than the .40 and 9mm?
Someone with some expertise weight in on that.....It just seems like even if its fires longer and...
Well that cut out the critical part of the post, but 300 WinMag seems to be the caliber of choice amongst the big game hunters I know, but also works well for their hog and deer hunts.
Though I believe my cousin buyers rounds with lighter than usual bullet weights, if that almost makes it a...