Quote:
Originally Posted by Drew Hause
Western Cartridge Co. never marked the Super-X ‘Field’ or ‘Record’ boxes with “Dr. Eq.” stating only “Maximum Load”. It is presumed that 12g ‘Super-X Field’ 2 3/4” 1 1/4 oz. was 3 3/4 Drams Equiv. or 1330 fps, and the 3” 1 3/8 oz. ‘Record’ was 1275 - 1295 fps (the speed of 1 1/4 oz. 3 1/2 Dr. Eq. loads).
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Thanks Drew for that additional information. Regarding the 3-inch 1-3/8 ounce load, I have a reference that its speed was 1315 fps, probably at 3 feet as generally measured in the US.
So now I have a question. Several of your posts here have referenced "Burrard's conversion" of tons (pressure) to psi. I've seen many period references in American sporting literature to shotgun breech pressure and stated in tons. For example, that production Winchester 21's were proofed at 7-1/2 tons. Another example from almost 90 years ago, verbatim, "pressure limit generally considered to be 5.00 tons
per sq inch". The underscore is mine.
So, why would it be that American readers needed to reference a little known conversion to convert tons to psi as measured with lead crushers?
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