No need to cry about bullet selection when using the Encore Muzzle Loading pistol.
Here in Colorado, sabots are not legal. You must use a full-caliber projectile.
The Encore 209X50 pistol can be easily loaded to duplicate .454 Casull ballistics; I have done it and the heavier loads in the T/C Manual do the same.
Just consider bullets such as hard cast (like you would in a .454, etc. etc.) or as I noted, the T/C Maxiball worked great with a single shot kill on a bull elk. And if you watch this video:
http://www.handgunhunt.com/photopost/showphoto.php?photo=1722&ppuser=872...you will see what a Power Belt bullet does to an antelope (by the way that bullet exited in case there was any question.)
There is a fairly new muzzle loader bullet out there from Hornady: the (full caliber) .50 caliber 300 grain FPB. Quoting from Hornady's website:
"Elastomer tip aids in expansion and clean kills at impact velocities from 800 to 2000+ fps."
(http://www.hornady.com/store/50-Cal-300-gr-FPB)
This would easily fill your needs, be it rifle or pistol for the Encore, and because it is of full caliber design (ie. not a saboted bullet) should be legal in any state that allows ML pistols (and rifles of course.)
I have not tried it yet but plan to in the future...