Someone else can no doubt give you a better answer, but on A) I imagine you could fire .45 Colt. The difference in case length may affect feeding, however. Question B) .454 will sure kill 'em quick, but so will .45 Colt. The idea of a revolver and rifle firing the same cartridge goes back a long way, and at woods range the old .45 is plenty. (Though in the day, no rifle was ever chambered for it.) If you're set on a pistol caliber lever carbine, I won't talk you out of it, but I don't think .454 Casull is necessary. I can tell you that hunting in western Kentucky, we had both thick woods and stands at the edge of fields where a 300 yard shot was very possible. Like I said, if you're set on a pistol caliber, go for it. But there are plenty of good rifle calibers available, including the good 'ole 30-30.
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