LONGTOM & Flynmoose: My T/C Encore Muzzleloader can bust 4" clay targets anywhere from 50 to 250 yards. I can not say what kind of grouping it does because I have never shot it at paper.
Now as for the Encore centerfire rifles, I have owned: 22-250, 1 1/2" at 100 yards was as tight as I could get it. .243 2" group at 100. 30-06 While it shot a 1" group at 100 yards at 300 yards it spread out to over 8 inches. .35 whelen, another 2" group at 100 yrds. .338 Win Mag, 2 3/4" at 100, off the paper at 300 (12X12" targets). My neighbor has a .416 Rigby barrel, we met one day at the range. I put his Rigby barrel on my Encore. One shot was all it took for me to realize I did not want one. While I hit the Bullseye (along the edge) I did not want to duplicate that shot. No the scope did not get me, but it hurt my whole body. About 20 minutes alter I drove Mike to the Hospital on Ft WW for 4 stitches, scope on .416 got him.
Maybe you guys can make the rifle barrels work, but they just did not come in for me. But I will say my buddy has a Knight, and we are not allowed to use a scope on muzzleloaders, here in Alaska. I use a peep site, and I can shoot rings around him. He, nor I can hit our clay targets beyond 150 yards with his Knight, Yet I can bust them every shot with my Encore. He can hit with my Encore at 200 yards, and with a little practice I bet he could hit them at 250, he just lacks the incentive. I use Federal 209 primers, 777 powder, and Power Belt bullets.