03 May 2026

The Case Against Universal Metric Cartridge Designation

The first example of how Universal Metric fails against simply naming the rounds is the number of 8x50mmR rounds where you end up naming them anyways.  Austrian, Lebel, Siamese...

But where it really rankles me is .22 Long and .22 Long Rifle.

UM is based on caliber x case length.

.22 Long and .22 Long Rifle are identical if you use UM.  5.6x16mmR.  This is because they use the exact same case.  .22LR uses a longer, heavier, bullet and more powder.  They're not the same.

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