Thanks to everyone who has shown an interest. I have just got back from a trip to my Mums in London.I have bought a K&M system with all the mandrels and stuff for both my cals.I think although some say it is a waste of time,i will feel that tiny bit better for doing my best to eliminate all variables.P.s i had my first shot at 600M at Bisley whilst i was there,hitting the bull was fun once i got my elevation adj sorted.This really builds confidence in my ammo as well as my ability as a Hunter.Load data 155Gn Lap Scenars, Lap brass.Fed 209 primers.44.0 Gn Vhit 140.Thanks again.John.