Old, Odd, Uncommon, non-standard caibres

.280 British (7x43mm). That would have been an almost-perfect service caliber for NATO.

>>32508179
then america ruined it

577/450, 577 Snyder, 455 webley, 12.7x44r, 44 Russian, 10.35x22r, and .43 Spanish

>>32508436
I've always wondered if an ak could be chambered in blackpowder .43 spanish or .577/450, for reasons and stuff

>>32508513
Two issues with black powder and semiauto guns.
One is that black powder blows it's pressure was rather fast. Any gas port would almost be right next to the cartridge.
Second, black powder is messy and gunks up parts real fast. And without a bullet to clean the residue from the previous round like there is with the bore, the buildup quickly become too much and malfunctions ahoy.

>>32506701
That Lee Navy cartridge had a baby. The baby is one of the all-time great .22s. To add to others already mentioned:

>.45-120
> Newton cartridges
>.32 WCF
>.41 magnum in a carbine
>16 gauge shotgun
>28 gauge shotgun

>>32506701
I have a fascination with .280 Ross. Effectively the first commercially available smokeless magnum rifle cartridge with a 130gr bullet that pushed 3000 fps (around 1910). I really wish Canada adopted the round with the rifle.

>>32508614
recoil operated maybe, and some sort of quick access cleaning port

>>32509109
Maybe.
I know that once cartridge guns existed, firearms designers were trying to make a semi or full auto version. It may just be a limitation of black powder that it can't be made into an autoloader. It wasn't 10 years after its widescale release before smokeless was made into autoloaders so the technical expertise was arguably there.

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>>32509314
on that note supposedly a semi auto martini

>>32509381
Not even close

>>32509381
>Patent date of 1885
>Smokeless powder 1886
Horrible timing if this gun would have worked. Used obsolete cartridges a year after its patent date.

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>>32508179
>>32508412
To its credit, the T65 cartridge was more accurate at the ranges they tested both cartridges. The .280 had about double the dispersion on target than the .30 LR.

>>32508655
Britain trialed a similar cartridge, the .276 Enfield. It showed promise but had considerably higher recoil than the standard .303. Testing fell by the wayside in 1914.

>>32510117
The data I found quickly show .280 Ross and .280 Remington are damn near identical in performance, but I bet a handloader could get a lot more out of the Ross in a modern bolt gun.

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7.5mm Kurzpatrone
6.5mm Eiger
7.5mm GP80

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>>32506701
7.5mm Kurzpatrone (1950s-60s)
6.5mm Eiger (1980s)
6.45mm Gw Pat 80 (1980s)

>>32511831
>>32511878
God damn it it told me it failed to upload. I hate this sometimes.

>>32511831
>>32511878
*5.56 Eiger

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>>32511831
>>32511878
I've got quite a few Swiss cartridges, I need to group them together for a new photo. The less common ones include:

5.56x45mm GP90
5.6x48mm GP76 Eiger
6.35x48mm GP80 (the early version of the 6.45)
6.45x48mm GP80
7.5x38mm GP52
7.5x53.5mm GP90
7.5x53.5mm GP90/03
7.5x54.5mm GP90/23
7.65x21mm Bergmann Machine Pistol
7.65x35mm Furrer Mittelpatrone
7.65x38mm experimental

Here are the Mondragon cartridges. The 5.2mm and 6.5mm were developed for a peculiar straight-pull rifle but the semiauto rifle most associated with Mondragon's name was chambered in 7mm Mauser.

>>32512949
do it