The barrels of both the Remington Autoloading Shotgun and the Remington Repeating Shotgun and later the Models 11 and 10 were stated to be
Remington Steel. They continued to mention
Remington Steel in the catalogs through the 1923. After that they don't mention the barrel steel.
Ordnance Steel was offered as an option for about $5 extra.
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Model 1908 from 1910 pocket catalogue.jpg
Mention of Ordnance steel seems to have disappeared before WW-I.