@rookhawk
The problems I see with the 243 are mainly caused by people not using the right projectiles for the game hunted resulting in a lot of wounded game. Unfortunately this has tainted my view of the 243 and I now regard it as the best wounding calibre ever invented.
I know a lot of cartridges could fall into the same category when not used correctly but unfortunately my experience with the 243 and the people that use it hasn't been favourable.
Loaded with a projectile to match the game I probably works quite well but I don't know because I refused to acknowledge it as useful because of my experience of others using it
Bob
@Bob Nelson 35Whelen My opinion of the 243 is "pretty good" but its certainly not how I prefer a rifle to kill.
There are two concepts of how a weapon delivers lethality:
1.) Heavy for caliber bullets operating at moderate speed, dumping all its energy in the animal while maximizing "hang time" to encourage more trauma. Examples of this concept include: 6.5x55SE, 7x57, 257 Bob, 35 Whelen, 300HH, 450-400, 404J, and 470NE.
2.) The Roy Weatherby philosophy that "speed kills". You move any bullet fast enough, you're killing with a gas bubble (hydrostatic shock and sheer), even more if the bullet has insane mass and energy, you may kill an animal from major vessels reversing flow from that hydro effect causing an instant stroke. 460Wby, 458 Lott, 450 Rigby, 300 Weatherby are very good examples of this effect.
The challenge with the 243 is it is much closer in kind to a 257 weatherby than it is to a 6.5x54MS. If it runs out of energy you're going to have problems. In addition to maintaining its energy, it absolutely is essential that the bullet efficiently opens and maintains integrity so that you're killing with hydrostatic effects, not with grain weight.
IF I was ever to give any nod to Roy Weatherby's concept for any calibers, it would be the 243 and the 257Wby. At least they have manageable recoil for the work that they do. As you scale up the size of the caliber beyond these I believe you enter an area of diminishing returns. An example: would you rather have a 340Wby or a 375HH since they have similar energy and recoil? The annals of hunting history suggest the slower, heavier bullet from the 375HH does better.
Obviously I'm very biased to "category 1" ballistics even though I've guided a lot of kids effectively with a .243.