I shoot a Tikka Master Sporter, very similar to your outfit. These rifles are easy to shoot and one chambered in 308 is especially forgiving. Some powders that your rifle might like are IMR4895, IMR4064, IMR3031, Varget, W748, H380, AA2520. Bullets to try Sierra 155 Palma, 168 MK, 175MK, Hornady A-Max same weights, Lapua 154 & 167 Scenar, Winchester Brass, and Winchester LR primers.
My rifle likes AA2520 with Sierra 155 bullet. But it shoots most of the above very well, ultimate accuracy was sacrificed for consistency, with AA2520 coming out on top with my gun.
bigbull