How Many Tune Rifles with Action Screw Torque

[phorwath]

Some members in a separate thread described tuning their bolt action rifles for optimum accuracy by adjusting the torque on their actions screws. I've never tried this before. Some posted some large reductions in group sizes by lightening or tightening the torque on the action screws.

How many have tried this enough to confirm that groups sizes will shrink or enlarge with different action/bedding screw torque on bolt action rifles? Care to share your approach and thoughts?

[BountyHunter]

Not me, torque em down to 65 lbs and tune with the load.

Now some have found that certain guns just wil not shoot there, but that is the exception rather than the practice.

BH

[Broz]

Interesting topic. I hope to learn something here. I always figured if it was bedded properly it should not matter if it is 50 or 65 in lbs.

Jeff

[BountyHunter]

Originally Posted by Broz

Interesting topic. I hope to learn something here. I always figured if it was bedded properly it should not matter if it is 50 or 65 in lbs.

Jeff

Probably the number one problem with ill shooting guns now. You would be surprised at the guns you see with that issue.

Set up the gun in a vise with a dial inidicator on the barrel and release the stock screws and see if the indicator moves.

BH

[nddodd]

I've done it with three different rifles two were Remington senderos one bedded and one not. I've also done it with a savage target action 338 edge.

My two senderos started at 35 in lbs and my stw wound up shooting best at 65 in lbs and my 300 ultra shot better at 50 in lbs. Went in 5 lb increments.

My savage target action started at all three at 30 in lbs and left the rear screw there and worked the center and the lug screws up together in 5 lb increments all the way to 50 but it shot best at 45 in lbs.

All my shooting was done at 250yds.


Just my experience,
Nathan

[jwp475]

Originally Posted by BountyHunter

Not me, torque em down to 65 lbs and tune with the load.

Now some have found that certain guns just wil not shoot there, but that is the exception rather than the practice.

BH

+1...........

[LouBoyd]

if the action changes position with respect to the stock between shots a rifle not going to be accurate. There should be a comfortable region between where the stock is so loose it changes position with firing and so tight it warps or crushes either the action or the stock. What that range may be depends on the recoil , the stock material, and the stock and action design. I test my rifles by adjusting the action screws both a little high and low separately to be sure there's a zone where the adjustment makes little difference and it shoots well. I prefer to run the screws about 10 in/lbs over where the accuracy falls off from being loose but not to exceed 60 in-lb. (for a Rem 700 in a fiberglass or pillar bedded stock.). The screw size, action type and stock material all matter in determining what torque to use.

I never "tune" a rifle to purposely shift the barrel harmonics using the action screws. It certainly can do that, but it means the effective position that the action is attached to the stock is shifting with screw tension which it should not. It can of course do that with a poor bedding job or if the action is "bent" over the magazine assembly. I only use screw torque as a diagnostic tool. It's the bedding or inletting which should be changed if it's not right.

There's not much point in doing load development until it's been determined the barrel and stock aren't shifting. That's true for the action to scope interface too.