Anybody know anything about this one? Or shoot it? Starting to clean up the house and found that bag of 17 reloads done by Custom Ammunition, LLC, down in here in Riverview FL. I think I ended up with it when I bought some ammo from the widow of one of his clients. Side note: I've been shooting Jim's loads for years in everything from .38Spl to .50BMG and never had a problem.
Anyhow if someone can use them let me know.

Ah, me, search engines are your friends. Just did a search and found it.

Perhaps it's 470 NE with Jamison brass?

Found a pretty good entry on it at Wikipedia. The headstamp actually reads 470 Nitro Express Jamison

no clue on the loads, Jamison only provides brass, not loaded ammo