A friend of mine told me the other day that you can use large rifle primers in magnum cartridges. Is this true?
If you are using the Winchester "Ultra" 300 Magnum may I suggest using the Federal "Gold Medal" match 215 primers? All the guys that are into "extreme long range" precision shooting here at the "club" use them...so do I. When asked what primer he used, Harlod replied by saying, "there is only one real primer". He was refering to the Fed. GMM 215.