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Backboring increases the entire diameter of your bore, from the forcing cone to the choke (if any). Lenghtening the forcing cone eases the transition in diameter from the chamber down to the bore.
Most of the benefits of these two modifications is in less shot deformation, as the shot has fewer "squeezes" to endure as it travels down the barrel. This will result in improved patterns.
Some folks say that either/both will decrease felt recoil as well. I am a high volume clays shooter, and I *think* can tell a slight decrease in recoil on guns that are both backbored and have lengthened forcing cones.
Bud
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