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Old May 15, 2019, 02:44 PM   #1
simonrichter
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.22lr with .22WMR bullets

Would it theoretically be possible to create a FMJ .22lr by using a .22WMR bullet given you manage to create a heel so it fits the LR case? Or would there be further obstacles arising? The bullet diameter differs by 0.02mm only, and other than many posts concerning .22lr vs. .22WMR claim, Wikipedia states that actually .22lr has the (slightly) wider diameter (5.72 vs 5.7mm)
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Old May 15, 2019, 05:55 PM   #2
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Could it work? Sure.
Worth the trouble? Not a chance.

Wikipedia is not a good source for cartridge dimensions.
.22 LR's tolerances are wider, but the nominal projectile diameter is .222".
.22 WMR's nominal projectile diameter is .224".
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Old May 15, 2019, 06:15 PM   #3
Jim Watson
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There was an outfit in RSA showing jacketed .22LR. Nothing seen about it recently.

WW II .22 ammo was FMJ to avoid reprisals against US aircrew for non-Hague bullets in their .22 - .410 wilderness survival Savages. A coworker assigned in Burma said they even withdrew the .410 shotgun shells for fear of Japanese mistreatment of prisoners from flights over The Hump.
https://www.quora.com/Can-you-get-a-...ullet-for-a-22

Makers of the American 180 .22 SMG had FMJ ammo made that comprised a .22 WRM shortened to LR length for greater reliability, but that is not quite the same thing.
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Old May 15, 2019, 10:18 PM   #4
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The American 180 may have had a special load available, but it was chambered for .22 LR - not some .22 WMR wildcat.
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Old May 16, 2019, 06:26 PM   #5
Jim Watson
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"Some guns were chambered for .22 ILARCO ammunition, also known as .22 Short Magnum rimfire, as it was a .22WMR (Winchester Magnum Rimfire) cartridge shortened to the same length as .22LR cartridge"

Source:
https://modernfirearms.net/en/submac...rican-180-eng/
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Old May 16, 2019, 09:43 PM   #6
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Quote:
"Some guns were chambered for .22 ILARCO ammunition, also known as .22 Short Magnum rimfire, as it was a .22WMR (Winchester Magnum Rimfire) cartridge shortened to the same length as .22LR cartridge"
Sounds a lot like the Winchester .22 Winchester Rimfire Automatic, that was used only in Winchester's Model 1903 semi-automatic carbine. Or the .22 Winchester Rimfire, that was the parent cartridge for the .22 Magnum.

.22 Winchester Automatic Rimfire (WRA or WAR):
Bullet diameter . . .222 in (5.6 mm)
Neck diameter . . .250 in (6.4 mm)
Base diameter . . .250 in (6.4 mm)
Rim diameter . . . .310 in (7.9 mm)
Case length . . . .665 in (16.9 mm)
Overall length . . .915 in (23.2 mm


.22 Winchester Rimfire (.22 WRF):
Bullet diameter . . . . .224 in (5.7 mm)
Neck diameter . . . . .242 in (6.1 mm)
Base diameter . . . . .242 in (6.1 mm)
Rim diameter . . . . . .294 in (7.5 mm)
Rim thickness . . . . .050 in (1.3 mm)
Case length . . . . . .965 in (24.5 mm)
Overall length . . . 1.180 in (30.0 mm)


.22 Long Rifle (.22 LR):
Bullet diameter . . . . .223 in (5.7 mm)
Neck diameter . . . . .226 in (5.7 mm)
Base diameter . . . . .226 in (5.7 mm)
Rim diameter . . . . . .278 in (7.1 mm)
Rim thickness . . . . .043 in (1.1 mm)
Case length . . . . . .613 in (15.6 mm)
Overall length . . . 1.000 in (25.4 mm)


.22 ILARCO:
No data available
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Old May 16, 2019, 10:26 PM   #7
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Quote:
"Some guns were chambered for .22 ILARCO ammunition, also known as .22 Short Magnum rimfire, as it was a .22WMR (Winchester Magnum Rimfire) cartridge shortened to the same length as .22LR cartridge"
Thanks.
I thought I knew the American 180 well. I appear to have been wrong.
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Old May 17, 2019, 03:22 AM   #8
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Ironic that the .22 Short Magnum is even shorter than the .22 Winchester Rimfire from which the .22 Winchester Magnum was derived, and the .22 Winchester Rimfire wasn't considered a "short magnum." It would appear that the .22 Short Magnum should have been named either the ".22 Winchester Short Rimfire" or the ".22 Even Shorter Magnum Rimfire."
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Old May 17, 2019, 10:08 AM   #9
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My recollection from the day when you could actually buy a submachine gun, is that the .22 Shortened Magnum was meant to improve reliability with a jacketed bullet. The action and magazine length was already fixed at .22 LR OAL, so they had to have ammo loaded as a proprietary round.
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Old May 17, 2019, 12:51 PM   #10
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The American 180 worked just fine with regular LR's. Great fun, so they were.
Changing a LR's .223" bullet to a Magnum's .224" bullet would be a gigantic waste of your money. You can buy 40 and 45 grain Long Rifle ammo. CCI sells jacketed .22's.
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Old May 18, 2019, 10:50 AM   #11
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Quote:
CCI sells jacketed .22's.
I'm pretty sure there is not such a thing apart from the WWII Hague compliant ammo made for the High Standard...
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Old Yesterday, 01:39 AM   #12
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In .22 LR it appears that CCI offers copper-plated bullets, but not "jacketed" bullets.

https://www.cci-ammunition.com/products/varmint.aspx
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