FWIW, you can easily use calipers and an empty .223 case to measure the rim thickness of .22 lr.
Put an empty .223 case in your calipers and zero them. Then, drop a .22lr round in the .223 case mouth and measure the OAL.
Put an empty .223 case in your calipers and zero them. Then, drop a .22lr round in the .223 case mouth and measure the OAL.