The Addendum to Vol I of HWS has an entry on page 281, thus:
[i]Apparently during the early 1920s Frankford Arsenal loaded some Cal. 40 soft point bullets into necked-up Cal. 30 service cases. This round was to become known commercially as the Cal .400 Whelen. Cartridges with cases headstamped FA 21 and FA 22-R have been examined from what is believed to be an Arsenal 20-round carton marked:
62.5 GRS DUPONT #17 POWDER
SOFT POINT BULLETS
JULY 23, 1923[/i]
I have in my collection what is a very similar cartridge. It is headstamped FA 22-R. The bullet appears to be either one of the old Western T&C Works bullets or a WCC bullet, but I’m not positive. It has the same appearance as other WT&CW and WCC bullets of that era.
Does anyone have one of these, or something similar, in their collection? I have my own theory of why FA would have loaded these - does anyone have a theory of their own?