Skeet, I have had some experiences with barrels that are the same length, same cartridge that have widely different chronograph readings. Also barrels of different lengths where the shorter barrel is faster. I have come to realize that when gun-writer says the latest zip-bang is so much faster; I would like to see the results of a 5 barrel average, and the slowest and fastest of the lot. Speaking with a barrel manufacturer, they said the barrels that air gauge a little tighter will shoot faster than the loose barrels. He also said they are not going to get into air gauging for tight barrels for sales purposes. No one would want the loose barrels. I agree. (If only they would sell me the tight barrels)!
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