Hcliff,
there's nothing odd about a .5 bullet unless of course you're not familiar with the .50ae?
Mr Gates?
John Linebaughs .500 is formed from the .348 Win. and trimmed to 1.4 for the normal Linebaugh cartridge now in production by several makers.
the Linebaugh Longs are trimmed to 1.6, I believe a couple makers are producing brass for the Long Linebaugh now.
The S&W .500 can't be formed from any cartidge, Hornady, Corbon and Buffalo Bore have loaded ammo and I believe Starline has brass.
I believe that the case length for the .500 S&W is indeed 1.610
No offence meant here Mr Gates but the .348 has been a very popular base for wildcatting in calibers from .22 to .510 because of it's capacity.
My wildcat books are full of calibers massaged by masters like Barnes, Ackley, Jurras and naturally Mr Gates!