That's it, I took up a BSA barrel from Leupy's of 55cms.
The groupings are horrible ! After 2.500 pellets, 5 pellets on 10 bring out of a KZ 40 in 50m !
I tried the JSB Exact Express 4.52 and the AA FT 4.52...
What are your councils about pellets... I am going to be sick !