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Recently I got a Colt Bisley .32-20 that was manufactured in 1902. I am going to begin loading some black powder rounds for it soon. I was wondering if it is okay to use magnum primers?
I do have some regular Small Pistol Primers but when those run out I don't know when I will be able to get more. The only thing available around here are Magnum Small Pistol Primers.
 

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I don't see why not. The "pop" of a magnum primer is pretty insignificant compared to a case of BP.
 

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I don't have a 32-20 or reload for one but you might also get more consistent ignition with magnum primers and BP.
 

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Sounds like a chronograph opportunity to me 😁
Vic
 

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Sounds like a chronograph opportunity to me 😁
Vic
I actually did that a couple of years ago with 44 Mag and a 7 1/2" Ruger Redhawk.
Mixed Brass
240 gr LSWC Rim Rock Bullets-Standard Cast
19.5 Gr IMR4227
10 Shots
Single Stage press, all charges hand-weighed.

Federal LPFederal LP MagFederal LR Mag
Avg105310761192
Es699660
Sd242818
 

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You should be more than fine using magnum primers with blackpowder. When you switch to smokeless loads, I would back down about 1/2 a grain if you want to try and stay with the same pressure. A bisley has a lot of extra metal in both the cylinder and barrel forcing cone when chambered in 32-20.
 

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Yes, I use Winchester Magnum primers in all my black powder loads, .45 Colt and .45 Springfield.
 
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