I like your M-L choice! I am loading the gear soon for the 1st round of our IL deer hunt. Either would work, but I have been using my 45 cal the last few years.
Not that your 777 pellets won't do just fine, but I would give consideration to a Blackhorn 209 switch. One of the best benefits is that you can set the gun down after firing and clean it a day or 3 later without corrosion worries. With a 3 day hunt, I usually don't do a full breakdown cleaning until I am home again. Even with B209 I still clean as soon as convenient though.
The Hornady 200 grn XTP or the 195 grn Barnes is just over 2200fps with 115 grains of B209, with my chronograph.