Been a while 'years' back, but I was playing with the 280 and 175 gr. noslers and hit a sweet spot with 53 gr. imr4831 cci 200 rem case 3.34 seat and a chronoed velocity of 2686 fps from my 22" ruger barrel.
I have yet to kill a damn thing with this 175 gr load, no excuses why just have not. Main reason partially being already had a 50 box full of assorted 160 grain loads 'partitions, accubonds, sst' that has taken a "few" years and much dead game to whittle down to almost empty status. In the 7mag, I know the 175 partition at 2900 is a heavenly combo of fast, flat and full of zap load
. Well, till I scorched the big7's barrel anyhow...
I know the lighter weights '120,130,140,150 get the lions share of work for the 280... wich I am also guilty of on rare occasion. So, for the other .280 toters on the 'fire, who runs 175 grainers in there 280??