Just purchased the Tasco Boresighter with 14 bore studs. I used it on my 3030 Lever Action rifle and it worked great. The scope on this rifle is low rise and the grid on the boresighter was perfectly clear and easy to adjust. I have not zeroed it in on a target yet as I am not in an area to do so and will have to do this later. However, when I tried the boresighter on my 303 Enfield British (which has a high rise scope) the grid was not the same. The grid was not as clear and seemed smaller, making it harder to align or adjust the crosshairs to the grid. Anyone have an experience with boresighters. Could this be because the scope is higher? I did manage to align the scope with the grid but was wondering if it will do the job right. Does the height of the scope make a difference to the accuracy of these boresighters? Thanks for your help.