How many short fat rounds will that NULA hold in the box? I seem to remember my buddy's 284 only held two down? I remember thinking it wasn't a lot of bullets for such an expensive rifle. Might not be remembering right.

Otherwise...everyone has already covered it, though I don't see why you have to handload for that round. In normal times, anyway, there is a ton of good factory ammo for the 300 WSM from 150gr to 180gr, plus a few slicker 195gr and 200gr offerings.