Thread: Suitable ammo for old hammer shotgun

Got a beautiful old 12 gauge shotgun I found at an arms show.
Have had a gunsmith check it all over and it should be safe to shoot.
My main concern is around the use of modern ammo.
It's not Damascus steel or anything, but doesn't have any nitro proof marks on it anywhere I can see. Apparently with this make, they never nitro proofed any of the guns they exported.

So it appears that if I want to be on the safe side I need to find some loads that are low pressure.
Ideally some custom reloads would be the best, but if anyone has any suggestions on what brands are available, that would be great.
I've found some off the shelf loads that are under 7000psi and likely suitable, but most retailers are out of stock.
I could go with b&p sub sound 28 or winchester AA featherlite. Falcon also have cowboy action rounds that are 980fps but I don't have the data for the pressure but it's likely low.
The winchester loads are the easiest ones to get currently.

Looking at reloading, there's tons of published loads that work, but not all powders are available here.
For example blue dot powder has a very close burn profile to black powder but is all out of stock.
I have seen loads with green dot and red dot that are suitable however.
Anyone have experience with this?