Number 6 shot was offered in the RX10Mag load through at least the December 18, 1950 Price List. By the 1952 Remington ammunition catalog #6 was no longer offered.
By the January 2, 1963, Remington ammunition catalog the RX10Mag was gone and the 3 1/2 inch Magnum-Ten was now offered in a plastic shell SP10Mag.
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