A few of us here remember the days before all of the great bullets we have today when Vernon Speer was taking empty 22 casings and reforming them and filling them with lead. In those days the 30-30 was a reliable killing machine (and still is) primarily because the bullets were made for that particular cartridge velocity and performed predictably and rarely if ever came apart.
Today with premium controlled expansion bullets the caliber/cartridge question is just about moot. I prefer a medium caliber at around 2800fps because if I screw up a shot (and I do) there will be less meat damage but that is certainly not the only way to roll.
