A 6mm Rem is a 7x57 necked down and so a .22-6mm is a.22x57.
Here is my "22x57" or aka .22-6mm.
I could be wrong, but I always thought the 6mm was based on the old 6 Lee Navy Cartridge ?
"Allways speak the truth and you will never have to remember what you said before..." Sam Houston
Texans, "We say Grace, We Say Mam, If You Don't Like it, We Don't Give a Damn!"
~Molɔ̀ːn Labé Skýla~
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