Well guys, you can use rifle scopes beyond 24x with specialty handguns using the 308 & 284 class cartridges, but you need to know what you are doing and I would advise having a brake or porting of some kind. You CANNOT have a full field of view and pull the trigger with these cartridges and not get hurt. Have someone measure how far your pistol comes back in recoil on average, take the furthest point and then add some distance for safety. Then, once you get a full field of view, back off to that safe point (or even a little further on your first shot). This will likely work better off the bench than from the field, but I will be practicing in 05 with a rifle scope from field positions with cartridges like the 6.5-284, 6-284, and 260 Remington.
I shot a rear grip specialty handgun in 338 Lapua Improved pushing 300 grain Sierra Match Kings with full loads with magnification over 24 power and never got touched (Ouch, wouldn't it hurt if you did though). I just recently purchased a Burris 6-24 Black Diamond with Ballistic Mil-Dot Reticle to see how well it works from the bench out to 1k and from field rests in hunting scenarios.