470: The .58 was an absolute blast, and very accurate with round ball loads. It now lives in Texas with a guy who feeds it scary doses of 777 under conicals. I only used Goex in mine. The .72 is even more fun though. There's something about those twin holes almost 3/4 of an inch in diameter. I also like the way the .72 handles -- Pedersoli makes the barrels thicker at the chamber to "stand the gaff" and builds them shorter than on the .58 to keep the feel alive. The effect is to make the .72 Kodak feel like a very, very purposeful tool for serious business, even if the business is perforating paper photos of Cape buffalo.