I am doing some loading for a Colt Lightning pump action rifle copy. The round is .44-40. Several of the reloading manuals recommend IMR-4227 so I made up 30 rounds. I had issues that I have never had before. I had two rounds where the primer ignited with enough force to shove the bullet into the barrel but not ignite the powder. I had other rounds that had unburned powder after edjecting them. The powder is new, from a new jug. I live in Arizona so humidity is not an issue. I have read on another forum that rounds have to have a good crimp for proper ignition. I have since purchased a profile crimp die and factory crimp die and I will be trying again. I was thinking of using magnum primers but another forum thread said magnum primers are not required.
Have any of you had this experience?