Sourdough......
First some facts:
.223 rem. 10" bull barrel of a friend gets right at 2700 fps w/his 50 grn handloads.
.223 rem. 12" Hunter barrel (10 7/8" rifled barrel & 1 1/8" muzzle tamer) of mine gets almost 2800 fps w/same 50 grn handloads.
I've wondered the same thing as you, I thought of trying the Nosler 60 grn Partition, Barnes 53 grn X-bullet, or the Sierra 63 grn semi-spitzer. They are probably more then needed for a fox or coyote, but the possibility of a wolf means we should go w/a lil' heavier or tougher bullet. The minimum I would want to use is a good 55 grn spire point bullet.
What do you have.....open sites, scope, red-dot?? Mine wears a Bushnell 2X6 trophy, I like the power range & fine cross hairs.
Keep us posted what load you try, and especially if you bag something w/that set-up!!!
Good hunting,
Del