Frankford Arsenal 30-06 marked 22-R



I have a 30-06 loaded that looks like a standard ball round. The headstamp reads “F A 22 - R”. I’m making the assumption that 22 indiactes 1922 but unsure what the R indicates. Unable to take a picture at present. Any ideas?



R stands for RIFLE anneal
can be found with the years 21, 22, 23, 25 & 30
see Picture


Thank you both for the information. My round has the exact same HS as the second round from the left in the picture by Rene.