Bought my first .243 Winchester quite a while ago, and have used various other 6mm rounds since, including the .240 Weatherby. Mostly used the 105 Speer Hot-Cor in that first .243, but also the 100-grain Remington Core-Lokt.
Since then Eileen abd have used 85 and 100-grain Partitions, 90 E-Tips, 95 Ballistic Tips, 105 Berger Hunting VLDs, and whatever 100-grain bullet Federal uses in their 100-grain blue box ammo. All have worked well from .243 Winchesters and similar rounds, but preferred the tougher ones in the .240. The deer have run in size from South Texas whitetail does to mature Montana bucks (both whitetail and mule) weighing 200+ pounds.
The only bullet that "failed" was a 105 Hot-Cor (now apparently discontinued by Speer) that left the core at the entrance hole on an average Montana eating whitetail at around 250 yards. But the core continued on and dropped the buck anyway.
