RE: most accurate .243 ammo
Only by shooting in your rifle will you know what is the most accurate...My Ruger loves the 100gr CoreLokts, if yours does as well, it's all you need for the intended purposes...I've killed over 90 deer with that loading alone...
I do also like the Federal Premium 85gr Sierra GameKing HPBT for long range shooting of whitetails as well...Once you get past 200 yards, this bullet really starts to shine...