I think alot depends on the type of shooting as well. I'm 6' and thin built. My S/S shotguns are 14 7/8" and used for game shooting in the winter, while my O/U gun is 15 1/8" and used for sporting clays and pigeons in the summer. The type of grip can be important too as for pistol grips the measurement to the grip is as critical as the measurement from grip to trigger (slightly different for straight hand stocks). It is different for rifles though because of the varied shooting positions. Look at adjustable stocks for 3 position shooting - shooters often have a different stock setting for each position (prone, kneeling, standing). For a hunting rifle you have to compromise between the 3 measurements. All I know is my factory rifles are all too short!