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OK, but Backboring and Lengthening the forcing cones are two different things. Backboring means increasing the diameter of the bore of the entire barrel. This is often done on competition guns to reduce recoil, but I could see how it might affect the shot pattern. Lengthning the forcing cone means increasing the length of the taper just in front of the chamber. If you do both it will definitely change the pattern because you have altered the entire barrel. Doing just the forcing cones without touching the barrel will not affect the pattern because yuou still have the same choke and barrel diameter.
My $.02
Geoff Ross
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