It's also important to note that large rounds are only RELATIVELY slow moving. When you're measuring speeds in the thousands of feet per second, losing a few dozen really doesn't matter that much in the grand scheme. The extra mass then more than makes up for the negligible loss in speed. There's a reason a 30-06 round is more dangerous than a .22 caliber one, speaking from my own experience. It's roughly the same comparison, only in rifle calibers instead of pistol. You shoot a bleach bottle full of sand with a .22 and it makes a little hole. You shoot it with the 30-06 and you're lucky if there's more bottle THAN hole. And, if you're me, are left with a pretty bump on your noggin as a memento to boot.