3 ms·

With calibers there is a difference between american .22 and european .22. As I understand it, the american measurement is slightly larger as it includes a bit

With calibers there is a difference between american .22 and european .22. As I understand it, the american measurement is slightly larger as it includes a bit of the rifling groves whereas the European standard was only the bullet width. So the same bullet measures slightly larger on the american scale. Or I might have that backwards, one of the two is different. https://www.rifleshootermag.com/editorial/comparing-american-and-european-rifle-cartridges/83489 https://www.rifleshootermag.com/editorial/comparing-american...

dogorman 5y ago
From what I understand, ".22 LR" is nominally .22 inches, actually is .223 inches, and is labeled as 5.6x15mmR in Europe while actually being something like 5.66mm (the 'x15' is the length of the case in millimeters, and the R means rimmed.) They are called different things and both are not quite their nominal sizes, but I think they're interchangeable in practice.