Winchester cases are thin walled. They may do ok with that much powderThat is a darn hot load! Some bolt rifles will not take that much pressure without very difficult extraction. My 700 likes that load with 180g Ballistic tips, but I think that 56.0g is the normal load.
Loaded 300 today with 58.5 & get 2900 out of a M70 & savage 116 both 22" pipesWell, does 57.5 with a 165 SGK count?
58.5 @ 2900 with two different 22" pipesFor about 50 years, one of my 30-06 loads has been 56.5gr of IMR 4350 with a 165gr Sierra GK-BTSP or HP at 2,800fps. Back then, I pushed it to 60gr and hit 3,000fps in that rifle with the 165GK, but groups were not as good as I wanted. So, I went back to the best groupings at 200yds with 56.5gr.
That load has taken untold game and a few varmints.