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Silly is subjective, but counter porductive can be measured. The lenth at which barrel lenth becomes counter productive is that lenth at which bullet friction is slowing the bullet down more than the chamber presure is speeding it up. That distance would depent on the burn rate of the powder and the amount of it. The max. effectant barrel would be shorter for a .223 than is would for a .22-250 for 2 reasons. 1. The 250 case is larger 2. To make the 250 shoot to it`s max you use slower powders in it and slower powders need longer barrels. I`m not sure were the breaking point is, but I do know that once you get to 26 inches the gain per inch in a .223 is not much and I would guess that some where around 30 inches, plus or minus depending on the powder, would be the breaking point.
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Catfish
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