found a link for 338-223 Straight and mentions headspace issues
I think the ME for the 1820 fps load is wrong. Unless I've forgotten how to compute it over the years, it should read 1470 foot pounds for ME it looked funny, and I'm a bit anal
(embarassed, but on the ther hand, being anal is one reason I'm still alive
)
http://www.reloadbench.com/cartridges/w338223s.html
A discussion about rebarreling an AR in 338-223 and mentions .338 Spectre
http://www.ar15.com/archive/topic.ht...f=121&t=400962
.338 Spectre based on 10 mm case and headspaces on shoulder (funky lookin thing, but pretty neat cartridge for a variety of reasons)
http://www.teppojutsu.com/338.htm