Loving your work @Happy !!! very cool.
Had one (T3) that out of the blocks shot cloverleafs happily then went a little bit wider over the following 70 odd shots have just had the Mod fixed (thanks guys!!) and have started doing a few of the things you have outlined @Happy and she's come back a trooper.
Don't forget to check the relief of the action in the stock and any wear marks or ensuring the floating lug is able to do exactly that and able to return UN-impededed to battery. Thanks to Nathan Foster in his book for that little gem and also to check the torque on the action screws as a result can make a big difference.
Sometimes the foreend of the stock in the T3 can be a little flexxy which under the right conditions (i.e a really tight sling or torqued bipod) can twist the stock to the point it touches the barrel.
Sorry to plug Nathans stuff but his stock stiffener can be awesome in this regard or putting a bit in the rear to re balance after adding a supressor.
Don't forget this can change the POI as it effectively whips like a tuning fork and a different touch point can markedly change the harmonics of the barrel. As does I think the screw tension of the moderator.
All of these things can play with your mind then you've got to add to that ammo or scope issue... Hence I think T3's get a bad rap and a its just a journey to understand whats going on before, during and after you pull the trigger you can find a solution...
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