RE: pellets/powder
Also with pellets you really should be using a 209 or small rifle primer system for your ignition.
Sabot loader pretty well covered it. Especially the cost. I was looking at some pellets when I was in the big city last time..$34.00 a box. And that is for only 50 shots. I get a pound of black powder good for about 70 or more shots for $12.99 a pound. You do the math.
All powders have to be swabbed (other then APP, Pinnacle, and Black Horn 209) so the advantage of pellets.. some rifles are very accurate with them. They are easy to load as you don't have to pre measure anything. And they have excellent power.