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« Last post by Bill Paton on September 21, 2025, 09:09:37 PM »
This post is from a long thread about straight rifling on this site in March of 2014. It’s pertinent to this discussion.
Bill Paton
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Re: Straight rifling
« Reply #9 on: March 16, 2014, 09:29:40 PM »
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Dillin writes that straight rifling was probably for better patched ball accuracy than a smooth bore would produce, and therefore done to make a combination gun. He also states that straight rifled barrels comprised about 15% of all American rifles (seems too high to me), and those he had examined were made before 1800 (many original percussion double rifles exist with one straight rifled barrel). He reports a shooting trial between smooth bore, straight rifle, and twist rifle at 100, 200, and 300 yards at a man sized target in which the straight rifle performed slightly better than the smooth rifle.
A modern maker of swivel rifles told me several years ago that he used straight rifled barrels to shoot shot better than a smooth bore, but they were touchy in that respect and needed very careful load workup to get the tightest pattern, which was better than a cylinder bore.
However, I have examined two flint swivel breeches (one early Reading and one jaeger) with one smooth barrel and one straight rifled barrel. Given the great accuracy advantage of spiral rifling, I think the makers of those two swivels intended them to be combination barrels for shot or more accurate ball shooting than a smooth bore would deliver. If they hadn't intended for shot use, they likely would have spiral rifled the rifle barrel for better accuracy.
Dan mentioned a friend who reported more accurate shooting with straight rifling than a smooth bore. I would like some of you shooters to do an experiment to compare straight and smooth rifle accuracy, working up the most accurate patched ball load possible. Maybe Dan's friend already has the data I am after and could report it to us.
My take is that straight rifled barrels were intended to shoot shot, and also a patched ball more accurately than a smooth bore could.
Maybe some data from you modern shooters could shed light on this issue. I am eager for the materials and methods, and the results to be reported.
I think the European 16 ga straight rifled rolling block Dan mentioned is like my fancy German double SXS pin fire with one spiral and one straight barrel, likely intended for shooting balls at red deer and boars in the woods, and hares and birds as well.
Bill Paton
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