I made an equivalent Mark7 load up with greek surplus bullets and brass, and using 2209. Shot very well and bang on velocity wise.
I am all for experimental archeology, but the Greek factory will not have been using surplus powder from WW2. The Greek stuff we have over here was made in the 1980's. If it was a ball powder supplied by Olin it is almost certainly is not the version of w760 that we can buy, for the reasons that Grandpamac has pointed out. Something with the right burn rate that gets the right velocity with a 174 grain FMJ will do the same thing. IMR3031, AR2206, 2208, 2209. Any will do.
Out of interest I know someone local who has 17,000 rounds of Greek surplus .303 in his garage. But he is a mad .303 person such as yourself, and will not sell any of it.
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