I put them on a 300 wby of mine. i used them so i could keep the scope bottomed out on the elevation dial so i could dial in elev. (german, not much adjustment), i did this insted of bedding the bases just to try them, i was a sceptic, but after 5 years they seem to be holding true, with no stress that i can detect. its kind of an easy shortcut to doing it the right way.. but it seems to work!