The best shooting Factory Ammo I have used is the Federal Power Shok 80gr. PSP. Federal uses the 80gr. Speer Hot Core Spitzer Bullet in this loading. While I have not taken game with the Factory Load using the 80gr. Speer Hot Core Spitzer Bullet I have used that bullet in handloads to take a couple of Whitetails with a 15" .243 Encore. Bullet performance was excellent, complete penetration with exit wounds the size of a quarter. In handloads I was obtaining 2920 FPS with the 80gr. Speer Spitzer Hot Core using H-4895 Powder. I never did chronograph the Federal Factory Loads using the 80gr. Speer Spitzer Hot Core Bullet but they grouped about like the handloads.
I also had excellent accuracy using 95gr. Nosler Ballistic Tips loaded with H-4350 in the 15" .243 Encore at a muzzle velocity of 2717 FPS but again never did take any game with that load. I believe Federal loads the 95gr. Nosler Ballistic Tip in their premium line.
Federal Premiums loaded with the 70gr. Nosler Ballistic Tip averaged 3074 FPS from the 15" Encore .243, with amazing accuracy. Varmints fear this bullet.
Larry