Hi all, been out shooting paper with my cz 452 17hmr today, went well until a little hail came and I changed ammo. I was using Federal V-max 17gr @ 50 paces, all went well, group was about 1/2 inch. Moved target out to 100 paces, ok but shooting 2 inches low - adjusted scope, problem solved. Then came some hail, quickly covered everything up under tarp - went to get fresh ammo from the safe - CCI TNT Hollow point 17gr. Used up the last of the first ammo (Federal 17g Polymer tip V-max) had 5 to use so just used them, rubbish this time - holes peppered all between 2 and 5 o'clock, about 2 inche