Greek HXP through BAR MkI

How well can I expect the CMP's Greek HXP headstamped 30-06 to perform in my MkI (late '60s) BAR?

Just like normal surplus ball ammo?

It's 150-grain ball, loaded to duplicate M2 ball ammo for the M1 Garand. By now the powder is so old that you may see a little lower speed but perhaps slightly higher pressure, depending upon how it has been stored.

I still have a can or two of HXP. My handloads shoot better through my M1, but it's good ammo.

Yes...what MZ5 says,

I use it in my M1 Garand...built November 1944.

Works great...