British pressure and a soup sandwich

[Edward Horton]

"There is NO printed data stating we have a 10% fudge factor in converting long tons to PSI."

Really? This is from a web page you referenced earlier in this thread -

"In Britain, a third set of crusher standards were developed, using a "base" crusher. . . The units were generally stated in British long tons per square inch, or tsi. Pressures indicated by this method run 10 to 20% below those indicated by radial crushers."

I'm afraid you've gotten confused between Winchester ammunition (including cases) and Winchester powder. Same name - but different products, manufacturers, corporate affiliations, and marketing/distribution channels.

Winchester Ammunition went belly up when it lost the Government Contract to produce ammunition at two different Government ordnance depots, Generial Dynamics now produces this ammunition under the Winchester logo like U.S. Repeating Arms does.

The pressure readings, I understood this to be the axial method produced 10% less indicated pressure on the crusher pellet but both methods converted to the same pressure, 18.5 tsi is not a plus or minus 10% figure and neither is PSI a plus or minus 10% figure.