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I just had my first run in with a bench rest shooter who basically told me (without knowing anything about me) that I know nothing about reloading. Although I am by no means an expert I have done my fair share of it with good results. But with the buying frenzy on handloading gear I was only able to pick up some magnum primers. I seated them in 220 swift cartridges thinking that it wont make to big a difference. Anyways upon talking to the bench rest guy he says to remove the magnum primers because they are only made for magnum cartridges and they could potentially blow my gun apart. So my question is should I go ahead and use the magnum primers or take the expert bench rest shooters advice and decap them?
Your bench rest friend knows nothing of what he speaks.
Magnum primers are NOT more powerful - it is a wives tale.
Magnum primers have ingredients in them to keep the temperature high longer to ignite heavily coated powders - some magnum primers will actually give lower velocities than standard primers, but will ignite heavily coated powders better.
They will not blow up anything.
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if it were me id take his advice he is a b.r.shooter and should know his stuff id rather be safe than sry or seriously hurt just my 0.2
Wrong - BR shooters are no more knowledgeably than any other group of shooters... and often are not as well informed as a general handloader. But their pompous attitude makes you think they are "superior" to all shooters
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Magnum primers are made about 5% hotter than standard primers. So goes the theory to reduce loads 5% when using them. I always use magnum primers, large or small when working with compressed powder charges or otherwise heavier amounts of slow burning powder or when I know the mercury will be in the negatives. The extra charge in the magnum primer helps to insure complete ignition on heavier, slower charges of powder. This is why all larger "magnum" cartriges use the magnum primer, larger amounts of slower burning powder that need a little extra kick to light them off. Remember that they make magnum small rifle primers as well, and about the only "magnum" label there is the .222 magnum that is almost indistinguishable from the .223. Hope this helps.
Not true... Magnum primers are not 5% hotter. It is always wise to drop the load and check when changing ANY component if your loads are at max, but the magnum primer may actually need a bit more powder to equal the old velocities.
Large "magnum" cartridges use standard primers, or magnum primers, depending on the type of powder - I use standard primers in my .264WM, 300WM and 375 H&H, because the powder I use is easy to light. I have no problems in low temperatures.
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