I bought a single round of 1924 dated GP11 back at the last local gun show in September.
Interesting measurements:
![image]()
If you can't read it
0.301" at mid exposed bullet
0.3065" bullet just above case mouth
0.335" at case mouth below the taper crimp.
0.336" where it seems bullet base ends.
0.333" at shoulder and case mouth junction.
Seems the bullet tapers all the way to the base and they used a tapered mouth crimp on it, just like a 38spl wad-cutter case.
Interesting measurements:
If you can't read it
0.301" at mid exposed bullet
0.3065" bullet just above case mouth
0.335" at case mouth below the taper crimp.
0.336" where it seems bullet base ends.
0.333" at shoulder and case mouth junction.
Seems the bullet tapers all the way to the base and they used a tapered mouth crimp on it, just like a 38spl wad-cutter case.