something somewhere is wrong dont know what yet. but something does not seem right. the guns you mentioned are mild compare to what i shoot. only thing i can think of u are shooting the low end nikons, and leupold, cause i have alot of vari x 3s and top nikons, and they are on 338s, 416 rems, 460 weatherbys. for years and hundreds of shots and never ever once have i had a problem . i can see maybe nikons, but i just dont know what to tell you, i have 4200 series busnells scopes also and i put them up aganist some of the best glass in the $550 dollar range.