From the introduction of the Remington Hammerless Double in the October 1894 Remington Arms Co. catalog They stated all their guns were suitable for nitro powders.

[Linked Image from i.imgur.com]

While no one can tell you over the internet what ammunition may or may not be safe in a given gun, the heaviest smokeless powder 12-gauge loads our North American ammunition manufacturers offered during the time the Remington Hammerless Doubles were being built were actually a bit higher pressure than today's SAAMI specs.

[Linked Image from i.imgur.com]

Last edited by Researcher; 04/07/23 09:54 PM.