I've done some experiments and found that, as a rule of thumb, using JSB Exact 4.52's in my Steyr, each 0.02 gn variation changes velocity by about 1 fps. According to Chairgun, this would give a change of POI of around 0.01 inch at 45 yards, assuming you are shooting around 775 fps.

So by my estimation, the maximum effect on POI of the weight variation in your tin would be about 0.2 inch at 60 yards - a bit more than a pellet diameter.


Alan