I shoot the leverevolutions in my handi. I havent ran any across the chrony but I think they run about 1800 fps. I had the same problem as you I couldnt find anything about how much these guns can take. I am planning to reload some of the flextip bullets to about 1800 fps because I know my gun will handle this. The load data for the flex tip bullets has loads up to 2100 fps I think. I dont think I will go over 1800 unless I find out it is safe.