If you've been following my replies the last week or so on this thread then you might remember I have been trying to improve a 'flier' issue with my 250z.
The tune I have run on my 250z .22 since I got the air rifle some months back has been shooting AEA 21.9gr pellets at 950-955fps. While it's been very accurate, it did have a nagging issue with an occasional 'flier'. By 'flier' I mean a shot that falls enough out the group that it's mostly unexplainable.
During the last week or so, I have been experimenting with minor regulator and hammer spring changes in hopes of improving the 'flier' issue. During the course of those changes it was quickly obvious that increasing velocity was not the answer. Moving the opposite direction to a lesser velocity has shown to improve, if not eliminate the 'flier' shots.
My tune is now setup to give my 250z 935-940fps shooting the AEA 21.9gr and nearly all 'fliers' have disappeared.
I fired this target this morning with the 250z/AEA 21.9gr. Of 40-shots fired, there was only 1-shot that I feel was a 'flier'. Going forward with the 250z I think it's shooting the AEA 21.9gr as well as I can expect..., and certainly well enough for my use hunting Rock Chucks!