There is guys that have wrapped a socket in sandpaper and just kept increasing the stock channel. One size up a time perhaps this is something you could do. I have a green mountain spoter fluted barrel I just got for my ruger m77/22 then I can use the stock that it came with. Minus the iron sites. the guy I bought it from had a hybrid sporter with a heavy end maybe this is something you could use if you wanted to shim it ?