I checked out the Bad Bull muzzleloader site and the recommendedlow charge for their smokeless muzzleloader is 100 grs of IMR 4350 and the max 140 grs with a 300 grain .45 bullet but no more than 4 pellets max like 777 or pyrodex. Holy ****!!!!!Thatseems weird about the max blackpowder charge. Here is a link.
http://www.badbullmuzzleloaders.com/html/faq.html