Yes I have the new Remington ultimate. It is a GREAT MUZZLELOADER worth every penny. The trigger sucks!! but I put a Jewell trigger in it and now it is sweet all the way around.
I shot all the Remington bullets in it and could not get any because the muzzleloader was so new. So, I shot some other bullet that some sites said you could shoot. THEY WERE WRONG. the bullet may be the same (and I'm not even sure about that?) but the Sabot is not. The 200 grain load is too hot and melts a hole through the back of the Sabot on the Barnes TMZ and TEZ sabots. I found the 250 grain THOR bullet and 270 Powerbelt Platinum shot GREAT for those open sight Colorado guys wanting to shoot this muzzleloader. Both shot under an inch at 100. When I went out past 300 the poor BC had the bullet dropping terrible. But with open sights it should be fine.
All that said, I was able to get some more Remington factory bullets (Hard Rem Sabot with 250 gr Barnes bullet.) My rifle shoot way better by far with the factory bullets and 200 grain 777 pellets.
The Brass is similar to a 308 or 06' case and you can use either die to deprime the brass. The brass is specially formed inside the brass to fit over the cone of the nipple so you will only be able to use the Remington Muzzleloader brass. I think they will last forever. I don't know how they would ever wear out??
It shoots under or at MOA out to 600 yards. Recoil is heavy but manageable. You do not need a muzzle break.
I have a 3-12x56 VMV Zeiss on it and it is a .333 click scope adjustment. Here is the drop data at 6000 elevation out to 600 yards with 5 mph cross wind hold data. I'm shooting 2330 fps at the muzzle and 2639 ft-lbs
Elevation is not the issue anymore with the accuracy and click adjustments...IT'S THE WIND!!! 3 MilDots (18 MOA) in a 5 mph wind at 600!
100 - 0 - 1/4 mil dot - 2301 ft-lbs
200 - 10 clicks - 1/2 mil dot - 1740 ft-lbs
300 - 24 clicks - 1 mil dot - 1288 ft-lbs
400 - 42 clicks - 1.5 mil dots - 962 ft-lbs
500 - 64 clicks - 2 mil dots - 740 ft-lbs
600 - 91 clicks - 3 mil dots - 605 ft-lbs
Hope this HELPS!