Shaun, you obviously are a reasonably experienced shooter. Although a lot of the information that has been given regarding stock length and comb height etc. is coming from Trap shooters. The Trap and Sporting disciplines are a world apart and what works well for one will not necessarily suit the other, but I am sure that you already know this. If you are shooting Sporting, then is it gun 'up' or gun 'down' or simply a mixture of both ? It is all relevant. One of my shooting companions recently had his Beretta EELL 'fitted' at a well known shooting ground. Shortly after buying it he had the stock raised, because he had convinced himself that he needed a high stock. After seeing him shoot the gun, both at clays and on a pattern plate, the stock fitter suggested he leave the gun to have some 'major' alterations made, in particular the comb height which was far too high. The work has been completed and he is now an average of 10 targets up on previous scores. This will improve as he re learns all the sight pictures that have altered, due to shooting a gun that was too high. The bottom line is that the gun now shoots where he is looking, without thinking about it. I think that most good Instructors can give advice regarding a reasonable gun fit, BUT, I do believe it takes a good stock fitter, using both clays and plate (and a try gun) to get it right. I feel sure that Ed will spot any abnormalities in gun mounting and stance and until you perfect that, the fine tuning is impossible.