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Measuring Action stress on M77 Hawkeye

This is a discussion on Measuring Action stress on M77 Hawkeye within the Gunsmithing forums, part of the Firearm Forum category; I recently measured stress on my M77 rifles using a dial indicator. I have 3 rifles - all 30-06. One is a factory original with ...


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Old May 7th, 2017, 04:20 PM   #1
 
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Measuring Action stress on M77 Hawkeye

I recently measured stress on my M77 rifles using a dial indicator. I have 3 rifles - all 30-06. One is a factory original with no modification. The other two have been glass bedded, one is a factory stock that I added pillars and full length bedded. The other is a McMillan Game Scout with recoil lug and tang bedded.

The dial indicator shows an interesting finding that I'm hoping others with experience can explain: The dial indicator show approximately .009 - .011" movement as I draw the recoil lug tight using a bar-type torque wrench. 45 in lbs. When I loosen the lug the indicator returns to the same starting place. .000"

I've tested everything possible and re-bedded the McMillan stock thinking I had introduced some stress the the action. Same result. The recoil screw draws the action to the stock at an angle, I'm thinking this may be the situation and normal for a Ruger action as the action is drawn to the stock. The two bedded stocks consistently shoot sub MOA groups.

The dial indicator result is the puzzle. I tested a friends Remington M 700 that I bedded and found .003" movement using the same bedding technique (surgical tubing tied to draw the action into the bedding, taped the muzzle facing and sides of the recoil lugs for clearance.)

Thoughts?



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Old May 7th, 2017, 04:31 PM   #2
 
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Thoughts? You're thinking too much, ha! J/K to each his own, I had not realized this was any kind of measurable quantity that mattered, but hey, I just shoot my guns.
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