Steven
I recently inletted a Boyds thumbhole SA for the DBM and this is what I did.
My rifle came as a blind mag centerfeed, and I bought the Boyds thumbhole for the older staggerfeed with the shorter action screw spacing. I knew this going in but the DBM inlet will cover up the extended hole. I noticed also that the action set a little high. I inletted the bottom so the bottom metal set flush on the bottom with the rest of the stock. The bottom is the part you really cant modify deeper or shallower because it will not look right if you get it too deep or too shallow. The action however, you can deepen. It took alot of extra dremel work to get the action deeper into the stock, and you must be careful to take down all surfaces around the trigger and the rear tang. You have to keep track of alot of things like the barrel depth, the trigger depth, and the side where you eject will have to be taken down a little to make it flush with the action. You also want to be aware of the gas escape holes on each side of the action and make sure you leave them just above the stock. I first got the bottom metal inletted to the proper depth. Then you can begin to slowly deepen the action while constantly assembling and fitting the DBM to check for feeding. I seated a bullet in a piece of brass with no powder and no primer to give me something to work with. You have to get the both ends of the DBM to fit at the proper height to make it feed correctly. You will notice at the rear of the mag. that the feed lips need to be just under the bolt raceway otherwise the bolt will hit the feed lips. Put it all together and keep test fitting until it will feed. The front of the mag needs to be almost touching the bottom of the action.
This was the first time I attempted to do this myself and I think it took me several weeks to get everything fitted properly. I also had to get my pillars cut to the proper height as well so I could Devcon bed the action.
Just go very slow and do alot of test fitting because if you mess up then you cant add the wood back.
I didnt really measure the height or depth, I just kept at it until I got it to feed.
It was a pain, but I am proud of the work I did. I put a Tru-oil finish on it and it looks great.
Hope this helps a little.
Bassman
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