Hi guys, Couple of years ago at a gun show I bought (cheap) 2 boxes of 180 gr. .308 dia. Herter's 1/2 jackets. I haven't loaded any cause I have no Idea what a speed limit would be for them, any idea? When I was a kid I bought a Herter's 1/2 jacket swage die in 308 and fooled around w/ it a little bit I had no Idea what I was doing and the most you could say is that they were 308 dia. I still have it and most of a box of jackets guess I should get it out after 40 or so years! -Muddy