Is there any meaningful difference? Most loads for the large body rifle cases I have see here call for the Fed 215M but they are virtually non-existant in Alaska now. In fact none of the load recipes for the 338 Lapua that I have looked at call for the Rem. 9 1/2 Mag. primer. But a local gun shop has 5 boxes of Remington 9 1/2 Magnums right now so I at least can get and load these now. Any advice on this?