If you go to this sight Nitro Express Forum, they have lots of advice for the best load to regulate your Kodiak double!http://forums.nitroexpress.com/postlist.php?Cat=0&Board=muzzleloadersNaphtali said:I finally scratched my itch - a .72-caliber rifle. The silly rear sight will go as quickly as I can regulate the barrels. I intend to mount one of Brockman's all machined steel wing-protected adjustable aperture sights. And the steel butt plate will metamorphose to a solid rubber recoil pad - 600-grain bullet with 150 grains of FFg is not something to look forward to with delight.