I was wondering if the advertised 600 fps was after 10 pumps? does anyone know how many pumps produce how many fps..etc?
with a stock 1377 about 15x or use a 4gr pellet 10 should do it
most shoot 525-550fps 10x 7.9gr pellet
Here are my stock #'s with a 2009 and 2010 1377;
2010 RWS Basic 7.0 gr pellets
pumps..FPS
2.......298
3.......350
4.......391
5.......424
6.......453
7.......470
8.......491
10.....518
2009 same pellets
pumps..FPS
2.......308
3.......366
4.......412
5.......446
6.......476
7.......498
8.......515
10.....547
And here are a couple of links to the threads where I explain how I improved them
with fewest $$
http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=3688.0 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=3688.0)
http://www.crosman-air-pistol-owners-forum.com/board/index.php?PHPSESSID=1a96ceb76019c795c1bfc257a2339d3b&topic=4088.0 (http://www.crosman-air-pistol-owners-forum.com/board/index.php?PHPSESSID=1a96ceb76019c795c1bfc257a2339d3b&topic=4088.0)
If you follow the links in the links, you will see these ideas have been used before
I found them in my research.
Have fun.....safely.
Also, if you look up the manual for the first generation 1377 on crosman.com, you will see that this gun NEVER achieved 600 fps with a normal pellet. It was always in the 500 fps range.
Later generation 1377 manuals don't have the velocity numbers published.