Primers

I’ve read a little about primers but have a question for the people in the know. I have used large pistol primers in my 44 mag with decent results, at least no failures or surprises. I will be buying magnum primers from now on for it. My question is if I use magnum primers in 45 ACP will it be a problem? Just trying to learn a little. The fewer choices I have the less likely I am to make a mistake.

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should not be an issue, I use which ever ones I can get for rifle and pistol…depending on the load and bullet type/weight magnum primers are often the ones to use.

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Magnum primers tend to be a little hotter than standard primers. This is because the powders used in magnums have a slower burn rate. You want a uniform ignition of the powder in the cartridge to get a consistent chamber pressure. Magnum powders can in theory not ignite as consistent as faster powders. Hence the need for a hotter spark. Consistent chamber pressure leads to consistent hits down range. With that out of the way magnum primers in standard loads in theory give you higher chamber pressures. Probably not enough to destroy your gun just stay away from max loads with magnum primers in nonmagnum loads.

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Rumor has it that Winchester primers are pretty much all magnum weather labeled as or not. In fact their large pistol primers are labeled for standard or magnum loads.

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I never noticed until now.

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I had a little time today so I did a little reading on searches about the subject. Seems that most say that if you use magnum primers in regular loads to cut the charge by 10% to make sure you don’t get too high a pressure. I was mainly curious. Now I have a little more info. Next is how does using non magnum primers in say a 44 mag perform?

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But you wanted a single primer to avoid possible mistakes, now you replace two sets of primers with being sure to cut the load?

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Inconsistent powder ignition. non linear powder burn in the cartridge causes unpredictable chamber pressure. chamber pressure consistency is key to repeatable accuracy.

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I’m not sure what you are asking. As I keep reading and learning I will use the primer that is correct for the load. I’ve always been a tinkerer, but in reloading safety is king so I won’t be doing much tinkering.

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I wasn’t asking so much as pointing out you started off IMO seeking to reduce the primers on hand to avoid mistakes, then introduced a formula that IMO that could create a mistake

Or so it seemed to me :slightly_smiling_face:

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:thinking: now I’m confused

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