It's interesting what Box o Truth says... they list #0 Buck.
Randy Wakeman also recomends #0 Buck as a close second to #1 as his choice for the best.
If you look at this poll though - it's not chosen at all. That's odd becasue with 0 in between 1 and 00 I'd expect it to be chosen by some people as a sort of in-between load or something but no one chose it.
I wonder if it's because #0 is hard to get?