Has anyone done this?
My SF WSM mag is too short, 2.890". I want a full three inches and 3.1" would be even better.

I'm thinking of milling the front of the action mag cutout forward about .200" and cutting a new slot for the tab on the mag box. I'd then cut the mag box in front of the shoulder ridges and silver solder extensions to lengthen the box to the required size.

This type of modification was common on Mauser actions being lengthened for full length magnums during the heyday of sporterizing military actions.

Does anyone offer this service or am I on my own?