Looking to by belted magnum brass any caliber split necks fine . Using it for 458 american

I have Weatherby 300 Win Mag... $75 for all. (The person who loaded it was a proficient reloader. I have shot some of his other calipers with confidence, was my niece's husband, cancer claimed him.)
37 handloads with 83.5 gr of IMR 7828, 180 /barnes TSX boat tail.
16 Remington factory 180 gr core lokt
30 Federal 13 nickel and 17 brass

Not looking for loaded ammo, just brass thanks