Re: Tikka T3 7RM
accuracy has much more to do with the rifle than the particular caliber. An excellent rifle chambered in 30-30 will outshoot a cheap piece of crap chambered in 338 lapua magnum. Your accuracy potential for a 308 T3 is the same as it would be for a 7mm remington mag T3. I would be suprised if you couldn't shrink your goups down a little in your 308. I've had a few 3.5" groups at 600 with my 300wsm. They are a pretty good rifle for the $$. Just work on your loading teqniqes and sorting brass. lots of honey loads for the 308 available. It seems like trying to develop a good load for the 308 from scratch is like reinventing the wheel.
Good luck, Mark.
I used to re-load but now I "hand-load".
-- Well, at least I try