Bedding troubleshooting help

mshelton

Member
Hoping to get some suggestions or help on this headscratcher.

I'm not an expert but have done close to 50 bedding jobs in my time, most all have tested to .000-.002 of movement on screw tests, those that didn't got redone. Testing is with a dial indicator attached in a jig to the barrel and indicating off the stock. But now I have a 700 repeater clone that I'm bedding in a stock, I have bed this thing 3 times now and the problem persists.

I've added aluminum pillars (pillars do not touch the action, bedding compound sits between the 2) and bed the rifle by making tape wraps around the barrel to center it in the channel, testing to make the action wasn't touching anything before moving on. Action screws are centered in the pillars and only touch the action and bottom metal. Nothing out of the ordinary.

On checking the bedding, when I loosen the rear screw the needle doesn't move, I tighten it back and still no movement. When I loosen the front screw I get -.010 worth of movement, the barrel gets closer to the stock which make zero sense to me. Any time I've had a fault in a bedding job, when loosening the front action screw the barrel will get further away from the stock indicating the action is getting stressed down, and I'd get the reverse from the rear screw.

What I can't figure out is how the barrel is getting closer to the stock when the front screw is loosened. First bed job I had a few pieces of tape on the bottom of the recoil lug as well as the sides and front so it would only touch on the rear where it mattered, Second try I bed the first inch of the barrel, same result. Third try I didn't tape the bottom of the lug and only the front, same results. I also tried not using the bottom metal and just some thick washers and the action screws, same result.

I'm kinda lost there what could be causing that binding.
 
Are you sure the front screw isn't bottoming out before it's tight? Is the bottom metal bedded as well?

GsT
 
Bottom metal is bed, the front screw if anything is a little on the short side. I think I have narrowed part of it down to the recoil lug which does but doesn't make sense.

Last night I decided to pull the barrel off, flip the recoil lug (lug at the 12 vs the 6 o'clock position) and tested it. Zeroed the indicator and had about neg .003-.004 movement right as I cracked the front screw but after a 3/4 of a turn it went to zero. Going to hog out the bedding, try some different screws, mill off .030 or so off the bottom of the lug and rebed it with the bottom of the lug taped.
 
just for outside the box, you might have some warpage in the stock. Only thinking this because you same things happening backasswards.
 
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