ftg99,
The spring 2021 issue of the Black Powder Cartridge News has an article about comparing black powder strength. There is a description of a replica eprouvette. You might contact Wolfe Publishing to see if that issue is available. If not, send me a PM.
The spring 2021 issue of the Black Powder Cartridge News has an article about comparing black powder strength. There is a description of a replica eprouvette. You might contact Wolfe Publishing to see if that issue is available. If not, send me a PM.