Years ago I worked with them on the Martini Ammo.

They rejected black powder loads and insisted on .458 diameter bullets. (they are in California) The used a Hollow base bullet to compensate for under sized bullets.

I have shot their ammo in both Snider and Martini and have no complaints. (okay cost, but if it was two cents more than free we would still gripe.) I do not know who's brass they are using these days. All the last batch I used was Jamison.