Sling for muzzleloader

[Brazos John]

I’d do it differently next time...

That's quite nice for a first piece!
I could use it on my poor boy, which doesn't have a butt plate or a patch box. I might borrow your idea.
But with your patch box, I would take what you have, and revise the leather butt piece to make a loop, and position it behind the trigger guard, like in Flint62Smoothie's photo, and then you can use the patch box.
Just a free idea...

 

[Fisherking]

I played with that idea AND thought it would work better for me, I didn’t, because I basically straight up copied someone else’s commercial design and thought I’d start there first.

I’ll go on record stating that leather stitching takes WAY longer than I imagined. No I understand why leather goods are expensive and I have tons of respect for excellence. There is an art there in just the simplest of application.

 

[Willy]

Some were talking about putting sling swivels on their frontstuffer. I might be called out for some kind of heretic, but I put a set on my old Navy Arms sxs 12 gauge years ago and still have it on there. It's just too handy for me. I used a Uncle Mike's quick detachable set up for a 30/30 lever action. Installed the stud just above the toe of the stock and the front mount that clamps onto the modern gun's magazine tube is on ferrule for the ramrod. I used a wide nylon easy adjustable strap for years on it, but a couple of years ago switched to a cloth/leather strap I saw at Wally World and liked.

 

[The Appalachian]

I wonder if there is brass hardware attachable somehow to provide
a vintage looking sling swivel?

This is typically what you will find for "vintage" sling hardware. Not brass but steel. I'm not sure I'd trust brass hardware myself to support an 8 to 10 pound firearm.

The large button goes in the buttstock where we would typically install a QD sling swivel on modern firearms, the other typically goes wherever on the forearm with a cross drilled pin between the barrel and ramrod.

The rear button can go through a round hole in the sling and would require unscrewing the button to remove, or it can use a "button hole" slot that allows you to work the sling off without unscrewing the button.The front "swivel" allows a simple buckle to adjust sling length, and sling removal.