mk7 ammo, what is the "best" out there?

[brnom2]

The below is my 5 cents worth's, its an observation of my experience only, not as a statement of fact. I was always told by my father and several of his friends (who were considered quite good shots back in the aussie fullbore days of .303 - pre the late 60's move to Omark's and 7.62mm - i.e. They were considered good enough to be very competitive on the OZ Fullbore scene) All of them considered the aussie manufactured ammo of 1957 to be the best - the best they could get then anyway. I inherited a quantity of ammo from my father (all in very good condition) and can comment as follows.
OZ manufactured 56,57,58 will group thru my 2 x No 4's at 300 to 600 yrds, as good as anything I can reload - as good as new brass with Sierra 174gr BTHP and ADI 2208.
(Note - I have only ever shot the above ammo in Fullbore style shooting - not of a rest at 100m for group size) Haven't had any real joy with any RG stuff - 54, 55, 56 - the groups just are not as tight and get the odd flyer.