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C-6–C-7 The dram apothecaries is equal to 3 scruples (s ap or ℈) or 60 grains (gr), [5]: C-7 or exactly 3.887 9346 grams. [5]: C-14 "Dram" is also used as a measure of the powder charge in a shotgun shell, representing the equivalent of black powder in drams avoirdupois. [16]
A 12-gauge shotgun cartridge in a transparent plastic hull, allowing the contents to be seen. From left to right: brass, propellant, over-powder wad, shot wad, #8 birdshot, over-shot wad, and crimp. A shotgun cartridge, shotshell, or shell is a type of rimmed, cylindrical (straight-walled) ammunition used specifically in shotguns.
For example, the barrel of a 12-gauge shotgun is equal to the diameter of a 1/12 of a pound lead ball (0.729 in) and a 20-gauge can fit a 1/20 pound lead ball (0.615 in). Using this method, a .410 bore is equivalent to a (hypothetical) 67-gauge, instead of the incorrectly labeled 36 gauge (0.506) in Europe and South America. [14] [15]
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.410 bore, shotgun equivalent; Notes. References This page was last edited on 4 August 2024, at 03:00 (UTC). Text is available under the Creative Commons ...
Shotgun shells are still rated in terms of the same archaic dram measurements, relative to their equivalence of smokeless powder load to a black-powder load weighed in drams.) John "Pondoro" Taylor mentioned in his book African Rifles and Cartridges that the 12 drams (328 gr., 3/4 oz., or 21 g.) charge would propel the projectile at around ...
The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
Once semi-smokeless and smokeless powders were introduced, the weight of powder needed decreased for a given level of performance. So, shotshell makers advertised dram equivalents instead. This indicated the equivalent power of a smokeless powder shotshell to an old shotshell using that number of drams of black powder.