I have a swfa 10x42 scope with about 150moa of total adjustment in it. Currently its mounted on Burris 2pc base and Burris signature zee rings set for 20moa with the inserts all mounted on a savage axis.

My goal is to have 110moa+ of available adjustment currently have about 70moa of available vertical adjustment.
I could stick a .040in shim under the rear base but I'm worried about getting it to the correct curve to sit flat.

Is it a good idea to use a stack of soda can shims? they would curve much easier.
would it be a good idea to stick two .040in washers under there and bed the rest of the space with jb weld or something?

Ring alignment is not an issue because I'm using the Burris signature zee rings.