so whats your shooting setup. Are you shooting off a bench with good front rest and rear bag, or lying prone and roughing it? 7mm Rm aint pleasant to shoot off the bench let alone lying prone. 7mmRM in T3 with fluted barrel is a very light rifle for magnum and will be very lively under recoil so it will be hard to have a repeatable consistent hold unless your really comfortable with the recoil.
Thin barrels tend to have smaller accuracy nodes. Do you think you have found an accuracy node yet? Have you got 3 x 3 shot groups over 0.3-0.5g powder range with same vertical impact point and relatively tight groups.
Have you done a seating test?
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