Why does my 30 yr
well if the bullet hit is jumping about its all down to your scope,,,it could be that its just "lose on its mount!" or its died on you,,like the cross hair is bouncing about inside the scope so with the recoial it jumps into a new place with every shot fired there by giving you a new point of impact,,,
this can happen if the scope was wound right up or down or left or right and strain was put on the adjusters,,,you may need to buy a new scope,,,,a good "air rifle!" scope will work quite well on most full bore rifles,,,yer right i here you say!!! ok,,iv got air rifle scope's on my .303 + 7.62 + 22-250 + .357 under leaver marlin cowboy, all 3 of my .22 rim fire's and they have been on these rifles for years now,,,1000,000, of rounds fired so far, with no problems! and no drifting so far,,,
an air rifle scope is very strong you know,,,but they only cost £150,00p or less for a good one?????
ps,,,,dont buy a tesco scope there cra*y