Ammo how is it graded by the makers?

[Joe Silvia]

When you read the specs of most makers match stuff they are all the same. So what is the difference in production between different grades of match grade from a given manufacturer?
Do they set up and run El Supremo then Match, then Practice then Plinker? If so what is the difference between the process?
Or do they run so many lots of the same recipe, Test and assign grade?
Anybody know for sure?
Joe

 

[Jefferson]

test and then assign a grade based on results

 

[Krogen]

That may well be true for certain series from a given manufacturer. Eley Tenex and Match are thought to be the same, but Match didn't make the Tenex grade. But Tenex/Match are clearly different in appearance than Eley Target. Different lube, different bullet. So they're from different manufacturing processes.