ORIGINAL: cayugad
It sounds like your building up a large fowling in the breech. A couple suggestions, have you ever tried Goex 3f instead of 2f it might leave less fowling. Also, you are shooting Goex and not Elephant powder I hope? Elephant was the only powder that left that kind of crud build up in my rifles. Needless to say I did not shoot much of it.
Another thing you can do is swab the barrel between shots with 91% isopropyl alcohol. One wet swab both sides, and then a couple dry ones and it should load easy again. It does sound like it had a tight bore though. Powerbelts are really easy to load normally.
Yea, I'm shooting Goex FF. I usually swab with the TC pre-saturated cleaning patches in between shots at that range. It works really well, but doing after every shot gets to be a pain.....and that business in the woods yesterday really had me jacked.