All good advice above, 1st port of call is super slender t3 light barrel when heats up, especially in summer will wander, much to most owners denial. That's why the manufacturer guarantees 3 shots for the t3 and 5 shots for the varmint contour.
2nd, as mentioned shooting tight groups at 200m is much harder than 100m and requires practice and getting a solid technique.
3rd, shooting a 308 Tikka from a bipod can be asking for trouble as plastic stock not really rigid enough. Not much weight there to absorb recoil so can bounce around a bit also. I shoot my 223 varmint off bipod but not my 270 for this reason as had trouble. Could also likely be causing other issues mentioned in other posts, even though sounded like shot fine at 100.
Try shooting the 200m first up next time, low and prone off front and rear bags. Take your time, let rifle cool, call your shots honestly if didn't feel right.
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