Welcome to Modern Muzzleloader!
Your Traditions rifle doesn't have the barrel issues that CVA created with some of their newer .45 cal rifles and the subsequent birth of those ELR Powerbelt bullets. Not many actual field reports by actual hunters have been floating around regarding the ELR bullets, so it's still a bit vague on how the bullets perform on animals: however, the regular Powerbelts have had a real mixed history: some people have done fine with them while other, and probably more at this end, have reported very poor terminal results on deer sized animals. Just about all Powerbelt bullets have shown very good accuracy.
Your Traditions gun can use sabots and jacketed pistol bullets in .40 caliber and you'll likely find the best accuracy using these two components. In my .45 cal rifles I've seen some super good paper results using 200 grain XTP Hornady bullets as well as 195 grain Barnes Expanders and 225 grain Fury Star-tip bullets with the 195 grain Barnes and the 200 XTPs having taking deer with outstanding terminal performance. Fury offers a few more weight choices in the .40 cal and other bullets makers also offer .40 cal bullets that work great at muzzleloader speeds.
You do not mention powder, but I'd stay away from pellet forms of powder as they restrict your ability to really fine tune loads and you and your gun are worthy of the fine tuning. Triple Seven powder comes in FFg and FFFg granulation size, the FFFG being the finer of the two and I've had super good results at the range and on deer in my .45 cal, black powder only, rifle using either the XTP or the Expander bullets mentioned using Harvester light blue sabots. A crush rib light blue sabot is also available should loading seem too hard with the plain light blue.
At any rate, congrats to you on your new gun and welcome again to Modern Muzzleloader!
