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Such loads have been used on Big Five critters many times by the likes of Ray Atkinson and

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"Ol Ray", did he use it in the field or just on his usual BS fictional braggy posts?

Did he ever post any pictures?

Was it hos 105th buffalo? Or his fifth buffalo?

Lets stick to reputable sources.

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I don’t really know Ray, although I have conversed with him on the net a few times, and I bought a few hundred .423” A-Square, Barnes, and Woodleigh bullets from him after he stopped shooting 404 Jeffs (He is now in his mid 80’s.). I see no reason to doubt his appraisal of the 10.75x68. The Griffin and Howe Mauser that he once owned had a 3.4” magazine, so 400 grain bullets could be seated way out there.

A few years ago, I had a fellow compare the the 416 Taylor and the 10.75x68 using quickload software. When one loads both cartridges to the same 3.34” OAL with similarly constructed 400 grain bullets, the 10.75 actually holds a few grains more powder than the 416 Taylor. While I would choose to not run the 10.75 up to the 416 Taylor’s magnum pressure, I would attempt loading to 60k psi (‘06 pressure). Quickload predicted that with a few powders (I recall CFE 223 was one) 2300fps is possible. That matches the old 60 grain cordite load in the 404 Jeff.

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