I bet somebody here has a box or two of ammo lying around that would fit this old sidearm.

Damm! I wish I did, I would donate them to the cause. Love to see that old girl shoot.

There is a guy out there in Innertube Land who makes the brass that's adapted to ignition via an off-center pocket that takes a .22RF blank. Insert blank, load with black powder or miniscule charge of smokeless, add a heeled bullet, and Bang! Don't know exactly where to find him, Google-iscious can probably tell you. Buy a cylinder full of cases, a box of blanks, and a mold to cast a .38 heeled bullet and you're in business.

Dixie Gunworks sells the cases that use a .22 blank as a primer. You use a .370 roundball as a projectile.

Dixie .38 RF Cases

Very nice! Where did you get it?

I like it

Got it at a local auction. There’s no finish left, but the action is tight and smooth as new. The $150 winning bid and the ivory grips are what turned me on.
‘Tis a Remington, but I expect you guys already knew that.