Hi Petesv,
I see that your rifle has a 1:9.25" twist. I do not own a .243 but I do have a 6mm Remington with a 1:9 twist and that's pretty close to your twist rate. Both cartridges use the same bullets. My best groups have been with 75 and 80 grain bullets. They stay in the 3/4 MOA range. I haven't done extensive load testing and I feel that I could reduce those groups with a bit more effort. The 6mm case is based on the 7x57mm Mauser round so my powder and load data wouldn't be of much help.
Where do you shoot? I lived in Suffolk for six years in the 1980's and belonged to a pistol club. We did shoot rifles on occasion. (Pakefield and an old MOD range in Rendlesham Forest) I've been to the ranges at Bisley although I didn't get to shoot there.
Cheers and let us know how your rifle shoots.
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