Thanks Katrina. As a rough idea, backboring by 0.005 in 12 gauge for 28"barrels saves about 0.7 oz per barrel (or 1.4 oz for a 2 barrel gun). This doesn't sound like much, but you can readily feel the difference if you will tape a 1.4 oz weight to the middle of your barrels and practice swinging it. Remember that you are removing weight from the entire barrel, hence the need to place the weight in the middle.
On this same vein, and since this is a Parker site, I'm a fan of having a much longer forcing cone bored into my Parkers. One flaw of Parkers, compare to the Fox, is their heavy and long frame. Lengthening the forcing cone does nothing to reduce the actual frame weight, but by reducing the weight of the barrels over the forward portion of the frame, the dynamic weight of the frame is reduced. Don't get me wrong, I'd rather have a nice Parker than a Purdey, but our English counterparts were not stupid in fluid shotgun design.
Thanks again
mtbirdhunter
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