Re: SP on savage target action
I can input a little on fast twist 3 groove barrels and bullets.
I shoot a Lilja 3 groove 8 twist 30" barrel in 270 at extreme velocities(for a 270 bullet)
Point one: It seems that the larger the bore the easier on the bullet as the 7mm cal has less trouble than the 270 cal.
Point two: the following bullets have yet to exhibit any problems in my rifle.
Nosler accubonds and ballistic tips.
Hornady boat tail spire points, lead tips (not SSTs)
All shoot really well but BCs are in the ditch in 270.
Point three: The only barrel data point I have is that "about half of the 3 groove Lilja barrels exhibit bullet structure problems beginning a about 400 rounds." Benchmarks may be a bit or totally different?
Given my experience I'd recommend going with a 6.5 vs a 6mm just for a bit of lee way.....
Also, most probably with the velocities that you will be shooting, assuming heavy for cal, high bc bullets, you won't see any problems at all with any quality bullet you use whether 6 or 6.5mm.
The only "factory" bullets I've had problems with were Bergers and velocities over 3450. Down around 3100 they gave no problems. Great for a WSM but puny for an extreme magnum....
Just my 5c worth......