With reloading components still hard to find, the question emerges: Can you use rifle primers in handgun cartridges? If you’re flush with rifle primers but hurting for pistol primers (as I am), it’s a logical question. To evaluate this, loaded a box of .357 Magnum ammo for my Colt Python. I tried to different loads of Bullseye (not an ideal .357 Magnum propellant, but it’s what I had available) and Winchester small rifle primers.
I thought I would simultaneously test for accuracy and reliability on Alco 4-silhouette targets at 25 yards, firing single action at the top two targets and double action on the bottom two targets. The first load was 3.2 grains of Bullseye, a 158 grain cast flatpoint bullet, and Winchester small rifle primers.
Accuracy was mediocre (if you’re ever assaulted by four little men with orange bullseyes painted on their chest, you’d be good enough for government work, but you won’t be taking home any accuracy trophies). The upper two little orange guys were fired single action, and every round discharged. The bottom two little orange guys were fired double action, and on those two targets, I had two misfires. That’s two misfires in 10 rounds, and that’s not good. When I fired the two misfired rounds a second time, they discharged normally.
The next target was a repeat of the first, except the ammo I shot at it had 4.0 grains of Bullseye. Everything else was the same. The top two targets were fired single action and the bottom two were fired double action. All rounds fired normally.
You can ignore the shots below the bottom two targets. I was just shooting up some ammo I had left loaded with different combos. The lower left group on the zombie’s green hand were .38 Special 148 grain wadcutter loads (with 2.7 grains of Bullseye); the ones between the two targets were .38 Special loads with the 158 grain flat point bullets and 4.5 grains of Bullseye (a very hot .38 Special load).
The propellant’s name notwithstanding, none of the above were not particularly accurate loads.
As to the primary question: Will rifle primers work in handgun cartridges, my take on this is yes, if fired single action. In double action, ignition is unreliable. On handguns with heavy hammers, you’re probably okay if firing single action. That’s true on the Colt Python, and it’s definitely true on single action Ruger Blackhawks (I have a .30 Carbine Ruger Blackhawk and I always load .30 Carbine ammo with rifle primers).
I suppose it’s possible that the two rounds that misfired double action in the Python may have been suffering from primers that were not completely seated, but I don’t see a need to continue testing. I learned enough from this quick look.
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