There is a guy locally that has the Greek ammo for sale- I can buy that or order some LC. Don't know if the Greek is boxer or berdan primed, so I will go with the sure bet and get the LC which is recent production, definitely boxer primed (I have 50BMG dies/press, etc.).
Thanks very much for your help!
Ronnie
https://www.ar15.com/forums/manageReply.html?a=modify&b=6&f=3&t=546328&tl=Greek-M8-50-BMG-quality&r=5989290&page=1#
ETA- I have sized LC M2-fired brass in 3 stages, lowering the die 1 turn at a time. I start off by backing the die out 2 turns and size the brass. Back the brass out just enough to turn the die and lower it 1 turn then size again. Repeat this again, so the brass is sized in 3 steps total. After that withdraw the brass to size the ID of the neck. I then anneal the necks before loading.
Sizing this way takes a lot less effort and is probably better for the press linkage. I will probably use virgin brass/fired in my gun from now on to make life easier.