Mk E has the right intent but I would surmise the BC's of both projies to be different giving the SMK 174 grain a different trajectory as a better BC not apparent at the 25yd ranging card supplied by milsurps you may find also you may not have to drive the SMK at the regulation 2450fps for the Mk VII round it may be at 2400fps for your riifle who knows.
Sadly like myself and others it is off to the range and shooting over the distances getting the data and then doping the conditions as at least you have the range plotted.
And whats happening at 300yds may be entirely different at 600yds.
I am not trying to put you off your endeavours but it has been said countless times the modern reloaded ammo or factory rounds are a totally different beast to the WWII issued ordnance.

Anyway thats what I had to do with all my 303's lotsa rounds down range and then when I used Highlands well there we go again, have fun I certainly did.