Haha, that brings back some memories.
A few years ago, one of my deer hunting buddies (a newfie) was hunting deer with a big single-shot 10 gauge.
Man that thing was loud, made all of our 12 gauges sound like .22's in comparison.
To his credit, he did get a deer. I guess you can fit a lot of 00Buck in a 3-1/2" 10ga. shell.