Corrections acknowledged & accepted, Joe. Thanks. I think this discussion has demonstrated that it is force and the rate of application of that force (quick slap vs sustained shove) that causes things to go amiss with our elderly rifles.
But I'm still unclear about the requirements for complete burning. The fast slap from 2400 is enough to push the case (1.5" long) from the chamber. When that happens, a non-blinking observer can see fire. If you can see the fire, the operating pressure must be close to atmospheric. But the action is then sprinkled with unburned grains of 2400. What is happening to cause that?
BTW, if you have one of these beasts, the 401 ammunition with Cabella's name on the label is apparently loaded with 2400. The stuff from Buffalo appears to be loaded with 4227.
