12mm pinfire
I was in the Springfield Armory museum one unseasonably cold rainy summer's day 41 years ago. The actual former national arms factory in Mass, not the commercial outfit in Illinois.
On display were were converted Trapdoors and Krags used as pressure testing guns. They used copper crushing as the means of measurement, which I have read is a laborious but accurate means of determination.
Point being, while I don't find pressure data on the bp US service cartridges, I am near 100% certain those tests were run.
Complete thread:
- 12mm pinfire -
A K Church,
2024-03-10, 09:16
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- 12mm pinfire -
Slow Hand,
2024-03-11, 08:18
- 12mm pinfire - A K Church, 2024-03-11, 09:49
- Sherman Bell did that with various BP cartridges -
JohnKDM,
2024-03-11, 17:04
- Sherman Bell did that with various BP cartridges -
Slow Hand,
2024-03-12, 10:16
- Have not seen him. I do shoot a lot of duplex loads -
JohnKDM,
2024-03-12, 12:38
- Have not seen him. I do shoot a lot of duplex loads - A K Church, 2024-03-12, 18:14
- Have not seen him. I do shoot a lot of duplex loads - Slow Hand, 2024-03-12, 18:24
- Have not seen him. I do shoot a lot of duplex loads -
JohnKDM,
2024-03-12, 12:38
- Sherman Bell did that with various BP cartridges -
Slow Hand,
2024-03-12, 10:16
- 12mm pinfire -
Slow Hand,
2024-03-11, 08:18