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Ammo used was federal gold metal match 168 gran .A quarter could cover the group . ... we did notice that if the barrel started to get hot the accuracy droped off
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I would test again with different ammo. I noticed the same effect with the exact same ammo only using a Tikka T3 stainless. I immediately followed up with my usual 150 grain soft points; accuracy of the rifle was still perfect. Switch back to Federal Premium Gold Metal 168 gr and accuracy was terrible again. Switch to some reloads from a local reloader, no problem with accuracy.
Gary