Von Gruff
That picture is what I was working off when I decided to remove old magazine box. My line if thinking was if the wood was used for the sides that it looked as if it was inlet for the old magazine box.
In the same thread that the 1905-404 was out of one post said that 1.013 was a good starting point for width of back of the mag well so I was checking old well dimensions and low and behold dead canter of that back wall was real close to 1.013 wide so just clamped the sheet metal to outside of old box this maintained original angles of the box.
The real kicker is that when I placed it together to see how much I could remove from back wall and keep case heads in front of bolt I found that I can take .06 off back wall. About half its original thickness. I do believe I could go a little more if I adjust the bolt stop.
The original mag well was 3.35 the new one has to be 3.54 to give it .01 clearance with .190 difference. Does this sound correct to you?
The back wall is approximately .115 thick if I take.065 that means I have .125 left to find. Can I get away with taking that much off feed ramps?
I gained .08 on the length and .125 on width. I don't have any 404 shells yet but I did push 3 .375 Ruger rounds down into the box and they fit nicely.
Shawn