my old coleman/crosman 2100 sends crosman wadcutters(7.4gr iirc) and crosman destroyer ex down range at 700fps and beeman crow mags(8.8gr) at 640fps 3ft from chrony(f-1) all at 10 pumpsnever had any seals or pump cup changed 100% original out of the box #s
I had a 766 as a kid and shot the daylights out of it. Loved that AG.so when I got the hankering for another pumper I snagged the Am77. The 3x9x40 Centerpoint came off my Trail NP. Actually a very nice combo.As for mods....just barrel stabilizer and brake., Oh ya..... I pulled the probe from the bolt out a bit so as to seat the pellet further in the breech.It's easy..just crack open the breech ,using thin needle nose pliers , wedge the probe forward. There are two holes in the bolt , when you can see through them you have gone far enough. I do get a puff of air from the left side , and after reading the numbers you're getting I guess I'll be pulling it apart to seal it. Any tips on sealing?