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As stated primers do make a differance. Fed. primers have a softer cup and for that reason have bee the choice for competation revolver shooters for years. Some are hotter than others and they will effect accuracy of your loads. You don`t want to use mag. primers in small cases. You can use standard primers in larger cases but when cases are full of a slow burning powder to will get alittle more velosity from mag. primers, and often better accuracy.
You would be waisting your time to go through what Petey doese though because you are useing a factory gun and his equipment is presion equipment capable of much better accuracy. Factory chambers are cut with larger dia. throughts and into lower quality barrels than his. I use mostly BR primers and go the extra mile in case prep, turn necks, do flash holes, and weigh cases, with some of my custom guns, but with factory chambers I trim to lenth and champfer the case mouthes. Right now I have Win., Federal, CCI and Rem. primers on hand and different guns get different primers. .222, .223, .17 Rem., .204 .22 BR and the others in this case size usually get Rem. 7 1/2 primers. .223 for the AR will get what ever primer I can get cheap as long as I can keep the groups below 1 moa. These rounds are for coyotes when hunting with dogs so shot will normally be off hand and at running targets and I can`t shoot any better than that.
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Catfish
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