Thread: powder reduction when changing brass?

I have got a bunch of PPU brass that I want to run through my 7mm Rem Mag (looks to be good quality) However it is significantly heavier than my old Hornady brass. If I dump my standard Hornady case load in one it is definitely higher up the neck so obviously has less capacity.

How much should I reduce my load by with this thicker brass? Current Hornady brass load is 72.6gr of AR2225 with a 162gr ELD-X with no signs of pressure (below book max).

Pretty new to this reloading game so any advice gratefully accepted, cheers!