POI "Really" Sensitive to Action Screw Torque

B

blauber

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Southern Ontario
Been all over the map with a 7mm Rem Mag. POI will shift 1.25 MOA down and 0.75 right depending on action screw torque. I have noticed that the screws work lose over several shots-due to recoil?

The firearm is a circa 1970's M700 bdl. When I initially took it apart, it had thin washers between the stock and bottom metal. I removed them but am wondering if there was a purpose for them? Would they help with keeping the action screws at a set torque? Btw, the barrel is floated with lug and 2" forward bedded-my other Remmy's shoot great this way.

Any solutions or other ideas on what could be happening appreciated.
 
Ok great, could use a project. I'm not planning on pillars but will bed the bottom metal too. I can see stock crush at the tang and inletting for bottom metal where the action screws are.
 
If you're not sure about Guntech's "stress free" part of the statement be sure to ask. It's VERY important to understand that part. That's why I'm stressing it with this post on top of his warning.
 
A buddy had a 700 with those washers. He removed them and had accuracy issues. Turns out the washers were giving clearance for the internal box mag. Once removed all he was torquing was bottom metal to the box mag. Accuracy returned when they were replaced.

However I also recommend bedding.
 
dfarrell said:
A buddy had a 700 with those washers. He removed them and had accuracy issues. Turns out the washers were giving clearance for the internal box mag. Once removed all he was torquing was bottom metal to the box mag. Accuracy returned when they were replaced.

However I also recommend bedding.
Click to expand...

I can see where washers could be used as a precaution to prevent a compressed internal mag box given the stock is wood. I shot it most recently on a hot / humid day and the barrel got hot as an oven. Upon cooling I noticed the front action screw could use tightening and that's when POI shifted down.

In the winter I did not notice this POI shift -this was after washers were removed. The firearm is otherwise capable of 1/4 MOA at 200 yds. Now I can see how shot to shot accuracy could become less reliable.

I have owned 3 bdls none but this with washer shims. For no good reason I don't care for them-maybe I sense a design hiccup. I guess because I can physically see stock crush that wood is compressing, and with the hot hot barrel, expanding.

I will give bedding a go - am familiar with "stess free" method, thanks BCRider.
 
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