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Message: <blockquote data-quote="Zeke" data-source="post: 1914206" data-attributes="member: 5357">Some guys say it impacts the load a full grain of powder when using a mag primer in a standard case but I'm sure that's just a "rule of thumb so guys will reduce their load a little.RookieWYhntr is spot-on!I just fire formed 300 rounds of brass in a sacrificial barrel and used mag primers because they were a brand that I don't use in anything and it was a good use for them. Didn't seem to make much difference on that load but there's a lot going on with fire forming which you won't have.Zeke</blockquote>