I think its the original synthetic stock, even when I glass bedded the action and small portion of the barrel before the action and made it free float the barrel, before bedding it it was shooting 3/4" but it was stringing in vertical direction, most of the fliers I get now are 3 o'clock, it could be me, last time I was shooting it in the rain not from very stable bench, very shaky which I setup under the patio the water was dripping down. I think this condition effected my shooting specially when huge rain drops hit my nose or face or the eye piece of the scope
plus fingers got wet and I just adjusted the trigger to its lowest setting, whatever it is, the original probably was like 5 - 6 lbs, I feel more comfortable shooting with light trigger pull, trigger itself when its wet is very slippery. Thinking to replace trigger assembly on it as well probably with Jewell or Shilen, but I haven't decide on it yet. Personally I had few misfortunes with Remington 870 and 597, in 870 ejector rail broke off after first shot, got it replaced no complaints now, the 597 I just can't make decent group from it at 50 yards and I tried all sorts of ammo, I gave up on haven't touched it in years. When I was buying 700 model I was mostly considering 700 action, I'm still planning to re-barrel it for faster twist, 1:12 is just not good enough for long ranges, I'm thinking about 1:7 or 1:8, but since the barrel seems to perform well I will keep it until it expires on its 6 - 7 K shot, I only got 200 so far, so its way to go.
As far as fliers it could be related on the bullet path as well, since I shoot through trees I have target setup in the wooded area, but I think by now I shot them all off :-D I did noticed that when flier occur there were also twigs foaling at least I thought I did, can't wait till the range will reopen in April, then I can do some better testing