Just a heads up, use regular small rifle primers(CCI 400). The magnums cause a really crappy burn and it took me a long time to learn that. I actually learned it in my 223...mag primer lost about 300fps relative to regulars.
They push the bullet too far down the bore and it causes lower chamber pressures. This applies for all reloading and is especially important in straight wall cases as the bore to chamber ratio is almost equal so the pressure drops really fast relative to bullet position in the bore(as the bullet moves down the bore, the chamber volume increases to include the bore and drops the pressure to accommodate the increased volume). This is why necked cartridges are better than straight wall.