I didn't see anythign on page 15, 16, or 17 to back up your opinion. Not saying you're full of shit, just didn't notice it, I'm sure.
But as far as basing a load on one component, I'm not. I'm thinking pressure, and if you're talking about bending your op rod, so are you.
As far as I know, when you shoot a heavier bullet, usually your chamber pressure goes up. (unless of course you're loading it down on purpose)
If CMP is saying nothing heavier than 180, then they must have seen op rods bending at 180 plus. This is because of increased chamber pressure.
You shoot handloads in yours if you know what pressures they are producing, but for the Original Poster, he wants to be able to hunt with his, and since he hasn't mentioned handloading, he probably doesn't.
Commercial should be ok, because it is rarely loaded as hot as handloads, on purpose.
So to the OP. Do as TRG said and enjoy hunting with a piece of history.
And as always, good luck.