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Had the same problem loading, my solution is Pyramyd Air PY-A-2932 Crosman Pellet Loader, Holds 16 .177 Cal Pellets
305906
Had to Dremel a small amount of material to allow pellet holder to clear...

I've also have had good results with Johnson's Paste Wax. I've used at least 3 coats buffing the first two.

The following from Ranchdog Outdoors load data page before it was taken down :
35 whelen 360-310 ( NOE Thumper)
Rl-7 27.2 grs 1538 fps 25K psi
29.5 grs 1639 fps 30K psi
31.6 grs...

I've had good success by using a 45 cal bore brush from the muzzle. If not successful pull the bore brush about half way back into the case and push the case out of the chamber. Bristles bend...