Clean Shot has been out of business around three years now. Your powder has either aged to inconsistency or been introduced to moisture... which breaks down it's composition.

Buy a new jug of 777, Pyrodex, Goex, Black Mag-3 or American Pioneer FFF-only. A.P. is the new, longer-lasting version of your Clean Shot. Even the former Clean Shot owner remains as owner of A.P. Powder Co.

After another 35 shots, let us know how you make out. It wouldn't hurt to buy some T/C-packaged bullets also in 180, 200, 240, 250 or 300 grain.