I set up to check the fit at the action while I wait on the to finish my forend repair. I started with inletting black around the recoil lug, and the flat behind it - using inletting screws to set it down straight (taped the magazine in it's place), then stock fitting t-handle screws to lock it in place.
Attachment 112412
As you can see, I'm only getting contact on 1/2 of the lug, and 1/2 of the flat. Easy fix on the flat. For the lug area, I can shave the high spot, and then if I don't get contact any more, I need to move that little rounded area where the trigger guard contacts back a bit. This would set the whole action back slightly.
Without removing any material, I then checked the tang, just to get an idea.
Attachment 112413
I think this looks good? nice even contact around the sides, no contact at the back, and no contact under the screw hole.
Next, with everything tight, I checked the magazine fit since I had stuck follower issues. There is indeed a large gap - more so towards the back than the front, although front is still big.
Attachment 112414Attachment 112415Attachment 112416
I think the pictures make the gap look smaller than it is because of the angle.
To address the overall fit, I'll start at the recoil lug, then the tang if it's needed. Then I have a decision to fix the feed cap. lower the bearing surfaces of the action, deepen the inletting of the trigger guard, or a combination of both. The last option I think is best as I can get a near perfect fit up top on all surfaces, then close the magazine gap within spec by adjusting the trigger guard inletting. This also has the advantage of increasing upward pressure from the barrel bed - so I won't get into any rules issues using the height of my dowel fix to adjust the pressure.
If this isn't the right approach, please chime in. Fall back plan is to order a perty Minelli stock and do it all from scratch. NO Dremel....hand chisels, scrapers, and files only.
Funny thing, I went to look at my 03a3 that has no feed issues for comparison. It's in an original straight stock. Magazine spacing is nice and tight...too tight. A little inletting black on the top edges of the magazine, and front screw hole, shows contact on the action. I suppose I need to file down top edges of the magazine until I don't get contact any longer.
EDIT: "Doco Overboard" has a really nice tips on the mdshooters forum https://www.mdshooters.com/showthread.php?t=232416
Is the bottom of the tang screw hole supposed to contact wood?