My factory 14" 223 liked 50 grain , most any brand. I did shoot mostly my reloads and they were 50 grain soft points , bulk DogTown bullets from midway. I did shoot a bunch of Black Hills after going to Wyoming and running out of ammo on Prairie Dog town shooting. Bought some at Sportsman Warehouse in Casper. They were 50 grn soft point and I didn't have to change my scope settings from reloads.
Good luck.
The 30-30 I had in a 14" shot the 125grn bullets mostly. Never tried 140 grain.
Took a couple of deer with Sierra Pro Hunter 125grn bullets and some Speer Hot Core 125 grn bullets.
Mike

You don't quit playing because you get old, You get old because you quit playing.