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A few years ago PRbullet came out with adapters one could use to utilize large rifle primers in one's muzzle loader. Breech plugs were modified so these adapters would fit, and they worked good.
The adapters are stainless steel, and are very very durable. Because the adapters are stainless, the don't 'crush', and most all the time there will be blow by. This blow by can be cured by utilizing an o-ring. The adapters are a larger diameter than shotgun primers. The primer socket in breech plugs needs to be enlarged for these adapters to fit. This can be done with a 9/32" end mill. One also uses the end mill to make the socket deeper so that one's rifle will go into battery when the o-ring is in place. Another thing done to the breech plugs was to enlarge the flash hole to 0.034". The adapters fit a 22 Hornet shell holder, so they can be easily primed, with any standard priming tool. Spent primers are easily removed in any standard press.
The large rifle magnum primers were tested in sub-zero weather more than once, and there never was a problem igniting Blackhorn powder, after the loaded rifle was left out over night. Unlike shotgun primers, the magnum large rifle primers do not erode flash holes. After 700 shots, measured flash holes were exactly the same as they were at zero shots. It seems like the adapters, and the breech plugs will last forever. ☺
The adapters are stainless steel, and are very very durable. Because the adapters are stainless, the don't 'crush', and most all the time there will be blow by. This blow by can be cured by utilizing an o-ring. The adapters are a larger diameter than shotgun primers. The primer socket in breech plugs needs to be enlarged for these adapters to fit. This can be done with a 9/32" end mill. One also uses the end mill to make the socket deeper so that one's rifle will go into battery when the o-ring is in place. Another thing done to the breech plugs was to enlarge the flash hole to 0.034". The adapters fit a 22 Hornet shell holder, so they can be easily primed, with any standard priming tool. Spent primers are easily removed in any standard press.
The large rifle magnum primers were tested in sub-zero weather more than once, and there never was a problem igniting Blackhorn powder, after the loaded rifle was left out over night. Unlike shotgun primers, the magnum large rifle primers do not erode flash holes. After 700 shots, measured flash holes were exactly the same as they were at zero shots. It seems like the adapters, and the breech plugs will last forever. ☺