Welcome to the world of Firearm Regret.
I never sold or traded a firearm that I didn't regret getting rid of. It's hard to say what would work best in your gun since all guns are different.
That's why I reload. Since you don't you have to try a bit of each to see what works best.
Pretty much any good quality ammo should get you close.
Having said that, The Hunting Shack sells Loaded Berger Ammo in 243 with 90 grn VLD bullets.
I find Berger bullets extremelty accurate in my guns, though I load 87 grn Bergers in my 243.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071