hello, i have got a cz455 varmint thumbhole in 17hmr over the last month i have zeroed it 6 times at 100 metres every time i get it crack on, put it back in a hard case take it straight home and put it away never bumping it but then the next time i come to get it back out again the sights have gone out again by 3 to 4 inches so no small amount and no wind where i am setting it.
i have tried two brand new scopes so have ruled that out.
i am using the same hornandy v-max ammo
when it goes out it still groups well, just in the wrong place and it is usually left or right and not up and