Does anyone know where I can buy a quality padded leather case for a N frame with a 8 3/8" barrel

Check out this link. I suspect some of our vendor holster makers could also accommodate you.

New Old Floral Carved Pistol Case

If you don't want to go the custom route, Ace Case Manufacturing makes leather pistol cases that accommodate long barrel revolvers. While not custom quality, their cases are decent and very reasonable. Google them up!

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Thanks I did check out the vendors first only noticed holsters.