RE: Advise on a .243
I've used it for 25 or so years. Everything I fed it killed deer. federal 85gr hollow points, federal 100 gr sierra game kings, federal 100 gr nosler partition, remington 100 gr core loks, 80gr core locks, hronady 100 gr Btsp, winchester 100 gr sp.
Just find what your gun likes. If I had to chose I would try the Hornady customs, 100 gr.