STarting off reloading right now is very tough, no to little powder of any kind is available. Maybe best to buy 5 boxes of factory ammo, all the same weight and type and ride things out of a while.
I have had great luck with:
win 760 with 55g is awesome
4895's
4064's
4350's
benchmark with the 50g
748
ball C2
H335
TAc
and IMR 4831 and R#19 with 63,64,65g bullets
AA2700 has one of the coolest burning rates of any powder you can choose for the 22/250 or 220 Swift, great for 50-55g bullets that I shot
with the 40g you can get by with IMR 4198 in a pinch if nothing else is available, and H322 and AA2015 also.
We are going to have to adapt and improvise for a while.
If you are shooting 1.5" groups at 100 yds, you are good to go on predators out to 250 yards or so.