I would check Dillon if out of stock there, search the internet for Dillon 10mm case gage. Can you tell I prefer Dillon? 
Good to know. I normally get Hornady, like my 9mm luger, but they don't seem to have one.Amazon has Lyman's for sale.
Thanks, I have done that before. I find all my barrels are a little different. Some of them seem looser than others. Since the gauges follow the SAAMI, I like them as a reference point.Your barrel makes an excellent case gauge. Remove barrel from slide and make sure ammo seats properly.
Works perfect for a 1911 type firearm.
It may fit the guage .... but that don't mean it's going to fit your gun's chamber !
Trust me on this one .
Gary