A long range gun would probably be found on a battle ship about 16in calibre. A rifle is a different story. Had a wanabee trainee culler a lot of years back who asked the same question, he was told that longer the barrel the longer the range and if he wanted to shoot the tops he needed to buy a rifle with at least a four foot barrel. Ran into him about 20 years later and his greeting was "your the c**t who made me look like a dick in the gunshop". Any way after mutual hullos he told me he had purchased a 7mm Remington Magnum which he traded in for a 308, a short time later because he found tha his average shot even on the tops was about 50 yards and very rarely except for Thar and Chamois did he have to stretch his barrel to 100 to 200 yds. He also found that a lot of hunters seem to have a great deal of difficulty gauging distance.
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