I have the same rig and have had great success. no issues other than barrel heat up. I am running 61 gr of RL-19 at mag length in Win brass, fed 215m primer, noz 140gr ballistic tips, full length RCBS dies. 3080fps is the sweet spot for my Tikka. with this load i am able to get .435 inch groups at 100, .68 at 200, .75 at 300 and 2 inch at 400 (nut behind the wheel problem , I do believe).
I have been waiting for the funds to finish the rebuild of the gun for going on 2 years. I have a Brux 8 twist, in #10 contour waiting in the safe, and 100 Matrix 175gr VLD's, that will be single fed do to being to long for factory mag and I dont feel like making the switch to ASICS system. The man you really need to talk to is Tikka Mike and BignGreen. both of those have t3's in 270wsm i do believe and are a cornucopia of information.
Good luck, stay safe, have tons of fun
Craig