Bedded my plastic stock T3 a few months ago too with match grade compound and stock stabilizer. Why stock stabilizer? because when prone, resting end of stock on bag I noticed that the groups went to crap when I moved ever so slightly to the next adjacent target suggesting that the stock flex putting unwanted pressure somewhere. I also suspected that having once not seated the recoil lug in correctly before tightening the stock screw may have resulted in crushing the stock a fraction, what gave me clues is that after it was re-seated right the mag took just a little bit more force to click in place than usual pop in click. This is when I decided to add pillars, replace recoil lug (old one peening) and bed stock all at once.
It had never shot factory ammo well and did a lot better with hand loads before bedding. Well after my bedding job the factory loads have really tightened up to surpass the hand loads (pre bedding) and that's with cheap prvi Partizan ammo. Need to redo my hand load development now.
The actual bedding job about what can go wrong is another story. Got there in the end.
btw my T3 takes two fouling shots from a clean bore before shooting right. I now only clean after every 60 shots. Those first two shots are just to random to be able to take the T3 hunting on a clean bore.
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