Having done several, the 300 WSM is one of my favorites. It's at it's best when hand loaded....the Nosler 180 Accubond is pretty impressive. Lapua's new 300 WSM case due out soon will be a welcome addition though I've never had issues with the Winchester brass.
As to the difference between rounds in a magazine....how many rounds do you need if you can't get it done with 3?
Good shootin' 👍-Al
