You do get a longer site radius for sure. Using GO 3f Lyman shows a 100 grain charge as having MV of 1882 fps in a 26” barrel, a 43” barrel 1978. At 100 yards 501 foot pounds compared to 461 foot pounds in the 26” barrel 92% of the energy. I like the looks of long and a 26”barrel looks like a sawed off gun to me, so is a 8% increase worth the extra weight if you can get over how ugly short guns are(sic).?Maybe in part. But, there was science behind that. From a chemical standpoint, black powder burns slowly, especially compared to modern smokeless powder. A Jaeger rifle with a short barrel and large bore got it's "punch" from a heavy powder charge and heavy ball. A longrifle got similar results because the powder was more fully burned since it was contained in the barrel longer, allowing greater velocity and muzzle energy.
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