i dont know if you're a reloader or not so ill list a few options. If you want factory shells fora decent price check out the remington 55gr powerlokt hp i believe i used 2 buy em for like 13 a box 2yrs ago. If you reload try 55gr sierra hpbt's. My pet load is 21.9gr of imr 4198 cci small rifle primers with the 55gr sierra. Each gun is different though. My 223 likes anything you feed it...
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Slayer
Savage Model 111 270win
Rem Model 7 6mm rem
Savage Model 110 223 rem
Traditions deerhunter 50cal
Horton Legend XT175
Horton Supermag
Browning Micro Adrenaline 48lb
Rage 2blades
Spitfires
Magnus Stingers
Fresh Backstraps.
For varmints, I use 50 grain V-Max or 52 gr. BTHP match, either Speer or Hornady. I use 28 grains of IMR 4320 for the V-Max, and 28 grains of Win. 748 with the 52 gr. BTHP's. However, don't start them at this. The primers show some pressure signs at this level.
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You may beat the rap, but you won't beat the ride!