@PERRISCICABA
If you have only tried the one type of factory ammo, you need to try some different ones. I agree with the above statements about the groups, it doesn't look like a scope issue. Try some Hornady, Federal, etc. It is amazing how much the groups can differ between different brands. Your 7mm RM group shows that you can shoot, so we know its not you that's the problem
The other comment about the clearing barrel channel is also correct, I have had to clean those ribs up on my other T3's as well as friends Sako A7's. You should be able to run a sheet of standard A4 paper up the length of the barrel without it snagging.
Also, shooting off a bipod can play havoc with your groups if done incorrectly. All the standard synthetic stocks (Irrespective of brand) have some play in them when front loading with a bipod. Easiest way to fix that is get a B&C stock, they are the ducks nuts.
Best way to test the rifle's accuracy is to shoot using a proper front rest/sandbag and small rear bag under the butt.
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