Yea, my 280 gr. bullets are running out of powder space at 55 gr. of imr 4350 too.
If i remember right 54 gr. with the 280s was 2230 fps.(not looking at my load notes right now). That's out of a 28"...well more like 25" of actual bbl. length,as the rest is chamber area.
Considering 20 mph. wind gusts that 54 gr. load may do better?
I see it was shot on a different day.
What's your take on it? Lol i'm just excited about it and guessing from the side lines...your the one pulling the trigger under some tough conditions there.
Have you considered trying a bit of crimp with the slower powders just to see? Next weekend is end of season for me(been hunting a grand total of 3 times this year).
After that, maybe before, i'll get my tail out and give these bullets a try.
Btw, how's the felt recoil from 53 to 55 gr. with 4350?