Also what is the COAL shown for 175 ELD-X in the Hornady book?
Probably 3.340" or less, I have my rifle's barrel chambered to allow the 175/180 grain bullets to not have the shank of the bullet just above the boat tail to be below the neck shoulder junction of the case which allows for being able to use a little more powder safely.
You should always work up your load slowly watching for pressure signs, flattened primers, ejector marks, harder bolt lift/extraction etc.... , if you experience any of these signs you back down your powder charge, neither of the loads I use have any signs of high/max pressure.