What’s this wear mark?

[Shankedit]

I wanted to ask brighter bulbs than me about the wear marks that have appeared in the inlet of my McMillan Hunter stock at the rear action screw and recoil lug. It's inletted for a Savage that's chambered in 300 WSM using a factory barrel but an upgraded .250" recoil lug.
I'm assuming these marks mean I'm getting movement when shooting and I'm also assuming bedding it would solve that? I torque the screws at 40-in lb as Savage suggests.
It shoots pretty dang good like it is, for a factory barrel and all—getting consistent groups of .75" or so at 100 yards and it'll usually hold that 3/4 MOA or so out to 600 as long as I do my part.
I've put about 350-400 rounds through it in the 5 years since I put this stock on it. I break it down at least once a year after hunting and give it a good cleaning and I don't recall the action screws ever being loose when I've done that. This isn't the first I've noticed it but like I said, it shoots fairly well so I never really dug in to find out.
Thanks for the help!

 

[Victor3Ranger1]

Get it bedded

 

[JKB57]

stock bolts loose and as said above get it bedded

 

[Rflshootr]

It's hard to tell by the pic, but to me it looks like there is a crack to the left of the rear pillar and along the rear edge of the magazine well. That would account for the movement causing the scuff. If in fact it is a crack, I wouldn't shoot it until it was repaired and bedded.

 

[AussieWriter]

Good bedding and a floating barrel is its own reward.