Originally Posted By: 400 Nitro Express
Quote:
Nitro proof didn't come out until 1904.

Not true. Nitro proof was introduced with the 1887 rules, and many original, full nitro proof rifles were built before 1904. A dedicated nitro proof mark (NP) was introduced in 1904 as an addendum to the nitro marks already in use.

400 Nitro Express is correct. In many countries the powder used was often part of the proof marks. This was to help insure proper use. This practice kept up in some parts of Europe until about 1950.

Cordite


Pete

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