Quote Originally Posted by Artfull-Bodger View Post
... On my Pro Target I know if the pellet will group well as I insert it as you can feel the pellet seat in the rifling, if it feels slack the group opens, if it's snug it groups well, I can't do this on my HW100 ,BSA Scorpion or MPR as the probe seats the pellet, but I found that of interest, my Pro Target barrel is quite pellet fussy but it got me wondering if there is a ideal head fit for your barrel.
Nice post ... thanks.

I know what you mean.

In my 77s I'm thumbing in the pellets. I can basically tell you if that pellet is going to be good or a flyer by the way it goes in ( from a known decent batch ). The ones that go in with a certain snugness will shoot well. If one just goes in with no resistance then it will fly, and, if on a course, I shoot those into the ground, after informing my colleagues.

The pellets are probed in with the S10. I measured some Prems and tested them and found that the bigger the better.

I've also done similar re pushing through and noting the rifling marks.