I am not sure I have been looking at the Remington Ultimate Muzzleloaders though man they are expensiveI have a stainless 50 cal Remington Ultimate.My main BP hunt gun is a T/C Hawken with a Green Mtn fast twist LRH STAINLESS barrel using the 209 primer adapter and scoped with the no drill and tap T/C base. Very accurate gun and reliable ignition with the 209 adapter and ignition system is completely sealed using the Mag spark 209 adapter.The Remington Ultimate is a good gun, kinda heavy to toto around through the woods.You can forget about getting any consistent accuracy using 150 gr of powder and I did not get consistent accuracy using the Remington sabots. The 308 primed hull ignition system is great and no blow back at all from the ignition system like in their older 700ML's. I have Ruger M77ML, Remington 700ML 50 and 54 cal stainless, H&R Huntsman stainless 50 cal (very accurate gun) with a custom made 209 primer adapter so as don't have to use the NLA 209 primer adapters, T/C Hawken and Renegade 50 cals with scope adapters,.The two preferred for hunting is the Hawken with the Stainless LRH barrel and next is the Remington Ultimate. I have a load recipe that works excellent in all the 50 cal's.The Stainless steel barrels are the way to go for a BP Rifle, lots more user friendly to get clean and keep clean after a shooting session.