Another vote for the Nosler partition. The .243 is a fine deer round in the hands of a decent marksman, but it almost requires the use of a Nosler partition or bullet of similar construction is case you mess up on your end of the gun. It will act like a typical spitzer until it sheds the front core and the rest of the shank will penetrate any deer I've run into, including one that I saw shot in the brisket and it took out a hambone on the way out and kept on going, and this was a South Dakote mule deer buck, dressed at a little under 275 lbs., and I was the one doing the shooting, it was done at just over 100 yds and it was the only shot I had because he had busted me on my stalk. We have a friend who insists we load 95gr. ballistic tips for him, we don't agree with him, but he loves them, he's shot 5 deer in the last 5 years with 5 shots, and he says they don't take more than four or five steps, but he also keeps shots under 200 yds and shoots from a stand with a rest. Use the partition for extra insurance.
Selmer