RE: T/C Omega
Get away from the American Pioneer Powder. I've never used it, but I've never heard anything good about the way it shoots. There was a very good comparison done between different types of blackpowder and blackpowder substitues in a magazine awhile back (American Rifleman, maybe?). APP had a much higher standard deviation between shots than any other powder (I think), poor accuracy and low velocities. Either Pyrodex or 777 will be much more consistent, provide better accuracy and higher velocities. If you want to stick with pellets, Pyrodex pellets seem to shoot more accurately for most people than 777 (I never had good accuracy with 777 pellets). If you want to go with loose powder, 777 loose has worked very well for me as long as you run a patch down the barrel in between shots. Blackhorn 209 seems to be the wave of the loose-powder future if your rifle can reliable ignite it.