Quote Originally Posted by rsterne View Post
I replaced the hollow bolt probe on a QB78 with a Crosman style extended central probe and picked up over 30 fps on a 30 FPE rifle on HPA.... Bob
100%

After having some trouble with my hollow probe, I made up an extended one and like Bob said: picked up 30-35 fps. Eric has both the hollow probe as well as the Crosman extended probe, you'll just have to decide which one...

And to echo everyone's suggestion - purchase/borrow a chrony!!! I would be lost without mine.

Todd