Thanks. I agree that these are not black powder guns based on the “NP” proof and Cordite denotation.

Very curious to know if these guns were generally proofed for the 750gr/100gr loads even if marked 650/90. I think I read that on an Explora post on the Westley Richards blog site.

Also, wondering if the 650/90 nitro load is anemic in real world use as a DGR. Does the lighter load and large frontal area cancel out much of the stopping and penetration power of a round like the 577 NE?