Lyman's Shotshell Reloading Handbook (4th Ed) has a good explanation of how barrel length effects muzzle velocity of various shotshell ammo.
The 30" produces only about 100fps more velocity than the same load fired in an 18" barrel.
I believe the major advantage for longer barrels for trap or pass shooting of waterfowl, is that the longer barrel gives you a longer "sighting" plain.
Art, Satterwhite's 870 with the 7 shot extension would have a 20" barrel. Do you know anyone who can do the modification on the 870 to allow it to shoot like the Mod. 12?
Satterwhite's 7 clays is quite a feat and I don't mean to take anything away from it (I KNOW I can't do it). But there is a bit of a "trick" involved in this which makes HOW the pidgeons are thrown as important as his excellent shooting.
Regards! DaMan
[This message has been edited by DaMan (edited October 03, 2000).]
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