It most certainly will and that in turn may help your grouping
Do what the lads say and get a decent recoil pad fitted, and try the ammo again [ after the shoulder settles down].
Use plugs or earmuffs or both when if your not alread when your on the range, believe me it helps.
As a rule neither the 270 or the Tikka are inherently inaccurate so if it doesn't shoot with that particular ammo I reckon it will with something else.
I've occasionally found a stainless barrel can sometimes take awhile to settle and what is a 1.4 group today straight from the box with out any mods could easily become sub moa after 60-100 rds and a bit of tinkering :ie your supressor and a recoil pad.
Be patient and work through it.
The joys of a brand new rifle mate.![]()
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