This chart shows when military U.S. ammunition began to be loaded with styphnate, or non-corrosive, primers.
The data is taken from TM 9-1305-200, 14 June 1961.
| Maufacturer Symbol and Lot Data | Ball M2 | AP M2 | API M14A1 | Trace M25 | Blank M1909 | |
| FA | Lot Number | 4149* | 887 | 62 | 44 | 985 |
| Acceptance Date | Oct-51 | Oct-51 | Nov-53 | Oct-51 | Jul-54 | |
| RA | Lot Number | 33853 | 5000 | |||
| Acceptance Date | Nov-51 | Apr-51 | ||||
| WCC | Lot Number | 6428 | 6000 | |||
| Acceptance Date | Jun-51 | Feb-51 | ||||
| SL | Lot Number | 9420 | 9467 | 7025 | ||
| Acceptance Date | May-52 | Jul-52 | Sep-52 | |||
| LC | Lot Number | 13700 | 13158 | 12000 | 12004 | 12000 |
| Acceptance Date | Jun-51 | Apr-52 | May-52 | May-52 | Apr-52 | |
| TW | Lot Number | 19362 | 19776 | 18000 | 18013 | 18712 |
| Acceptance Date | Dec-50 | Feb-52 | Dec-52 | Dec-51 | Sep-51 | |
| WRA | Lot Number | 23201 | 22007 | 22000 | 22000 | |
| Acceptance Date | Aug-51 | Jun-54 | Feb-53 | Sep-53 | ||
| VC | Lot Number | 42000 | ||||
| Acceptance Date | Apr-45 | |||||
| DAQ | Lot Number | 44000 | ||||
| Acceptance Date | Aug-45 | |||||
| * Odd lots assembled with P-4 or styphnate primers since 1947 |
||||||
Walt Kuleck