We know Ball, M1 was adopted in 1925 according to Hatcher. Also in 1923 they were testing different degree boat tails (based off the Swiss GP90 FMJ) and settled on the 9 deg one to become Ball, M1.
However I have a box that has FA 21 headstamps.
Was M1906 production stopped and put on hold while they were working on M1 Ball and this was made from earlier components?
The box states it’s powder F.N.H. Army lot 1471- 1922
Ammo lot F.A. 1645
When was the first official lot of M1 ball?
Wish Ray was here…lol