I had to come back and eat a little crow.
Being the hard headed person that I am, I had to try the Tikka supplied bases/rings for myself. After trying out 2 brands of factory ammo, I was unable to get consistent shots within a 4" ring at 100yds. None of the 3 shot groups were very tight, and the rounds would land all over the place but stay within the 4" diameter. After close inspection, I saw evidence that the front base had moved / or was moving a little. I quickly ordered some Game Reaper Deadnutz and re-mounted the scope. I finished off one of the partial boxes of factory ammo I had left as well as tried a 3rd brand of factory ammo. After I found the ammo that my gun liked best out of the 3 brands tried, I consistently achieved 1" three shot groups. I'm going to hunt whitetails with this ammo this season, and probably try a few more brands in the spring to see if I can get down to sub MOA groups. I'll probably go back and give the first brand of ammo another shot with this new scope mounting as well, since none of those went down the barrel after the Tikka supplied bases/rings were scrapped.
Tikka T3 lite / stainless in .270 win
Brand 1) 130gr Remington Core Lokt
Brand 2) 130 gr Hornady SST
Brand 3) 130 gr Federal Fusion (consistent 1" groups, and my hunting round this season)
I can't say enough about the deadnutz mounting system and their excellent customer service. The finish of their silver mount matches the finish on my rifle very well, and looks great with the silver Nikon that I'm using.