Buckshot, definitely, but I agree that 00 isn't always the answer. Personally, I load #1 buck and have 0-buck in the sidesaddle. I hoard/store/collect 00-buck because it is the cheapest, but I prefer the smaller buckshots, since they send more pellets downrange.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face