Otto Witt called them families; 38 Special, 38 Special +P, and 357 Magnum brass and/or nickeled cases with the same style of headstamp. By sorting cases into families, and grouping families into a matrix you can more efficiently display your cases, identify what you don’t have, and speculate on what might be possible. Example:
Starline-made SPEER-headstamped brass and nickeled 38 Special and 38 +P cases family. Missing the 357 Magnum case.
This is what I know about Remington 9mm Luger families 1995 to present.
- Late 2009 to Present: squared 9, lower case m’s bottom alined on a circle running from bottom of 9 to bottom of L.
Observed: brass and nickeled standard, brass and nickeled +P, brass +P with +P removed.
- Late 2009: rounded 9, lower case m’s tops alined on a circle running from top of 9 to top of L, only brass standard observed, relatively rare.
- 2009: squared 9 similar to 1. above, lower case tall m’s.
Observed: only brass and nickeled standard
- 2008: small rounded 9 and small tall lower case m’s. +P similar to 7. below but has larger letters, look at the G.
Observed: brass and nickeled standard, brass and nickeled +P
- Last Half of 2007: large squared 9, large wide lower case m’s.
Observed: brass standard and nickeled +P
- First Half of 2007: large squared 9, small lower case m’s.
Observed: brass and nickeled standard
- About 1995 Through 2006: small round 9, misalined lower case m’s.
Observed: brass and nickeled standard, brass “9 LUGER +P”, brass and nickeled “9mm LUGER +P”, and brass “9mm +P+”.
- About 1989 to About 1995 – and these may NOT constitute a family – large round 9, upper case M’s.
Observed: brass standard, brass “9 LUGER +P”, brass "9 LUGER +P’ with +P removed, and brass +P+ with lower case m’s.
Comment: Although not observed, Type 5 above should have nickeled standard and brass +P cases. By the way, in 1. thru 7. brass +P cases are much rarer than their nickeled counterpart.