A friend had long used Winchester or Remington 777 primers with Pyrodex pellets in his .50 CVA Mag Hunter with no problem.

The other day he called and said his rifle would not fire. He brought the gun by here: He had run out of Pyrodex pellets and bought White Hot pellets. The 777 primers were too weak for the job.

Gave my friend some Black MZ powder and some Winchester shotgun primers. Now i have bunch of White Hot pellets.