02-06-2020, 06:23 PM | #11 |
Join Date: Jan 2005
Location: Down in a holler
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Re: TL 5-8 firearms in Ultra-Tech calibers
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02-06-2020, 06:27 PM | #12 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: TL 5-8 firearms in Ultra-Tech calibers
Well, in the case of .308 Winchester and all those other ".308" rounds, they had a barrel with a bore of .30", which happens to require a bullet diameter of .308" to seal it properly.
I'm not sure why .303 is that calibre, but the bullets are actually 0.311" for a 0.303" bore. Nor do I know why 5.56mm rounds are 5.56mm/0.218" or 0.219", with bullets of either 0.223" or 0.224", except that .22 Long Rifle and other rounds of similar vintage were in that calibre. .270 Winchester (and other .270 rounds) use bullets of 0.277" (exactly 7mm) in a 0.270" bore. "7mm" rifles use 0.284" bullets in a 7mm/0.277" bore. Oh, and to make matters even nuttier, the US tends to measure barrel diameter groove-to-groove, and Europe tends to use land-to-land. Then there's rounding, and 'cool name' effects - .38 rounds have actual bullet diameters of 0.357"/9.07mm for a 9mm bore, and the name comes from the cartridge neck's external diameter. Basically, there's no rhyme nor reason to cartridge names or dimensions, though there might be for a given individual round.
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02-06-2020, 06:56 PM | #13 | ||
Join Date: Aug 2005
Location: Cowtown, Canada
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Re: TL 5-8 firearms in Ultra-Tech calibers
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02-06-2020, 08:10 PM | #14 |
Join Date: May 2005
Location: Oz
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Re: TL 5-8 firearms in Ultra-Tech calibers
Well, possibly 8.8mm would have been Too Much Bullet.
Alternatively they were trying to copy the mighty .30-40 Krag and mis-translated "inches" as Zolle. "A Fuß is a foot, right? And an inch is a twelfth of a foot, so an inch is a Zoll. 0.30 Zolle".They ended up firing their "7.92mm" cartridges through barrels that were 7.9mm between the lands and 8.2mm between the grooves, so the designation really was an overly precise metric conversion of an approximate calibre in obsolete units, while the thing was actually specced in tenths of a millimetre.
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02-06-2020, 08:10 PM | #15 | |||
Join Date: Jan 2005
Location: Down in a holler
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Re: TL 5-8 firearms in Ultra-Tech calibers
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Nomenclature is mostly just whim and advertising. In the US we actually have an organized body to try and get some standards in play and keep folks from blowing themselves up but realistically I suppose they have spent the last century mostly herding cats, gun-people being the way we are. Quote:
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02-06-2020, 10:33 PM | #16 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: TL 5-8 firearms in Ultra-Tech calibers
Also note that both the SAAMI and C.I.P call the 7.92x57mm Mauser "8x57". The original version was called the Patrone 88 by the German military, and the next version (with the modern dimensions) the S Patrone. The British called it "7.92mm" when issued to their tank units for the Besa machinegun, which may be where it became commonly known as 7.92mm.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
02-07-2020, 12:56 PM | #17 | |
Join Date: May 2010
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Re: TL 5-8 firearms in Ultra-Tech calibers
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For black powder weapons I wasn't suggesting having 5mm or 10mm examples, more like 10mm and 15mm versions of say the Kentucky rifle whose official stats in HT are for 0.45 in. I think higher calibers for spherical bullets should have longer range holding muzzle velocity constant due to a higher ratio of mass to cross-sectional area but I'm not certain. |
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02-07-2020, 04:58 PM | #18 | ||
Join Date: Aug 2004
Location: Wellington, NZ
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Re: TL 5-8 firearms in Ultra-Tech calibers
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7x57mm Mauser: 6d+2 pi 6.5x50mmSR Arisaka: 6d pi About what you'd expect from a full-power military cartridge of the late 19th/early 20th century. Quote:
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02-07-2020, 05:16 PM | #19 |
Join Date: May 2010
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Re: TL 5-8 firearms in Ultra-Tech calibers
Good catches. I also found a 6.8mm weapon in Tactical Shooting. The 6.8mm weapon is TL8 and its stats are pretty darn close to the TL9 7mm weapon. Also, after more research it seems like the weight of a modern cartridge is generally around 50% brass, at most? Given that I might go with cased versions of TL9 caseless weapons halving half as many shots and otherwise being identical.
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02-07-2020, 05:26 PM | #20 | |
Join Date: Jul 2008
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Re: TL 5-8 firearms in Ultra-Tech calibers
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