I have several sets of Sportsmatch fully adjustable mounts. They seem to be stress free on the scope and they provide a solid mount which will maintain POI once locked. They require only a moderate amount of adjustment trial to set up and can be adjusted to the point that only a few clicks are needed for final zero if you want to optically or mechanically center your scope. As noted they are not cheap but if needed to correct any alignment issue they are fantastic. Have used them with no shift on a Diana 460.