Nope....243 is too small...Marginal at best...Not ethical....
Lets just say that I have tried all the bullets except the ballistic tips...Inside 200 yards, the deer will never know the difference between a 100 grain CoreLokt, Hornady, Federal Premium in Nosler Partition, or Sierra GameKing...Past 200 I really like the Federal Premium 85gr Sierra GameKing BTHP...
Just my opinion from using a .243 over 25 years on 150 deer or so...
Forgot to mention...Mine is a Ruger M-77 (older tang safety) I had it rebarreled to 24 inches a few years back, its pillar bedded, freefloated and trigger set at
2 1/2 pounds. I also replaced the old Bushnell Scopechief with a Leupold VX-II 3x9x40..Which I sent back to Leupold and had the Heavy Duplex reticle put in...
I have never lost a deer with this gun.