The table where I got that just says pounds and I misstated it is actually 11,700. It does discuss in the booklets how pressure is measured and it is a lead crusher cylinder behind a .2250 inch diameter piston. I've got two booklets, one 1928 and the other 1933. The table in the 1928 booklet uses Tons and the table in the 1933 uses lbs. -- 11,800 lbs for Schultze giving velocity over 40 yards 941 fps, 12,600 for Ballistite giving velocity over 40 yards 966 fps and 11,700 for DuPont Smokeless giving velocity over 40 yards 943 fps. Meanwhile, 40 grains of their DuPont OVAL was only 9,400 lbs. giving a velocity over 40 yards of 981 fps. The payload in all cases being 1 1/4 ounce #6.
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