If you find any Federal 85gr Sierra Game Kings, buy them up! They drop deer like a bolt of lightning. Why Federal stopped loading them I will never understand. They shoot extremely flat and are accurate as well.
THERES TWO THINGS THAT'S A MUST FOR A 243 ONE IS H-414 AND THE OTHER IS 85 GR BTHP GAMEKING SIERRA THAT IS A DEADLY COMBO IN 6 243 THAT'S PAST THOURGH MY SHOPgun)
Every gun is different without a doubt. But I would bet that the 100gr. core lokt is gonna be the ticket. I bought my mom a 243 and done a ton of research before I went ammo shopping. The 100gr core lokt is preferred by most from what I found. I tried it and was very impressed. Whatever remington's recipe for it works well if not great across the board. I have never liked a 243 until I bought one.
I have using H-414 with WLRM primers. I now trying the Berger's 95 hunting bullets and getting very good groups at 200 yards. I using a Ruger 77 that is 243 improved .gun)THERES TWO THINGS THAT'S A MUST FOR A 243 ONE IS H-414 AND THE OTHER IS 85 GR BTHP GAMEKING SIERRA THAT IS A DEADLY COMBO IN 6 243 THAT'S PAST THOURGH MY SHOPgun)