I have been overloading dozens of cartridges for 15 years to see what happens. This pic is from 9-12-2003.
1) I would have bet money I could not get as much velocity in 270 150 gr as I did with Re17.
But once I include the temp sensitivity into my derating calculation for a useful load, Re17 is down with the rest of the powders and trajectory that changes with temp.
So I never used Re17 for anything after that, due to my wide temperature range hunting.