I didn't know they were a colder primer - I've always been told just the opposite, that BP primers were hotter to get the powder to go off. I've also been told they're just shotgun primers in a different package. Anyways we're not shooting rifles looking for a one hole group, but shotguns we just first want to fire a shell. If it were me, I'd go with the hottest primer I could find, like a federal 209A. JMHO. Good luck.
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Paul Harm
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