I load for my .270, .30-06 and 30-30, using H4350 and Varget. Been using Federal 210 Large Rifle Primers but I can't find them anywhere. I can get Winchester or CCI. Is one a better substitute than the other? None of the loads I use are close to max so I'm not too concerned about pressures but I would like to use the primer that is closest to the Federals so I don't need to start from scratch on new loads.