From everything I've read only the Fed209A and CCI209M are hot primers. Everything else is about the same with slight differences. Remington primers are usually considered the ones giving the least pressure. I use the Cheddite primer and if loading at low pressure, say under 7500psi, I don't worry which of the mild primers is used in a formula. The pressure won't change all that much. PB, 7625, and 4756 are all discontinued. It's too bad because many of us liked them. American Select, Promo, Red Dot, Green Dot, and E3 are some of the powders I've used for light low pressure loads. I'm sure there's many others.
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Paul Harm
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