Fred M'
I wouldn't recommend the Sierra Game Kings either because of them opening too quickly -- from what I've heard. But I've also seen Rick Jamison (the Shooting Times 'man') state that he lost his best deer -- in Pennsylvania -- to a 100 gr' Hornady. FWIW, Jamison is not at all my favorite writer, being 'lost' at times from what I can see..... But he wrote that his buck was lost to some Ohio hunters when the Hornady didn't anchor it. Of all things, this was in his article in ST's "High-Performance Calibers" booklet in 1986.....recently picked up at a show here in NE Ohio. Yes, the 100 gr' Hornady spire points may be somewhat changed today, but I don't know if I'd expect them to be the answer in the .243 cal' either. I'd rather go with a lighter, faster bullet.....but Gander Mountain didn't have them. It's a compromise that my buddy will be gambling on, much as I hate to say that. With the slower impact velocity I hope that they will open up and do the job.
Take care,
SS'