Hate to say it, but PowerBelts...My two brothers and two hunting buddies used them a few years, they lost some and recovered some...I've had better luck with saboted type bullets...I just feel like there are better options out there vs a bullet that loads easy...
In traditional muzzleloaders, I've killed a few dozen deer with a .45 caliber round ball in front of 75grs of FFF Goex...I went to a .54 when bears showed up a few years back on our farms...They work equally well with 80grs of FFF Goex...