If you decide on a .72 - I'd get the single shot .72 cal. Gibs. They are well made for a factory rifle & actually better than the Kodiak's I've seen. I have not seen a .72 Kodiak, though, only .54's and .58's.

I have a .69 Custom cap-lock designed after an English Sporting rifle, that is wonderfully accurate, as well as a .58 Kodiak which actually regulates well, but only with moderate, 110gr. charges. THAT's the stickler for what is actually an inexpensive double rifle. Will it regulate. A few of the guys here have them in .72.