In my opinion, a 243 especially with 100 gr bullets is under rated. I would have to say yes.
If you want to prove it to yourself, stack 2 feet of newspapers in a plastic garbage bag, place it in a containing cardboard box, with the flat side of the paper up and down, like oreos in the container.
Wet it with enough water to soak all of the newspaper, then pour out the excess water. Tie the bag shut and take it to the range.
Shoot it with your gun, and see what penetration there is, see how your bullet holds up. Peel back the wet newspaper, layer by layer, and look at the wound channel, and find the bullet.
Scientific? no. But it is a practical way to judge a gun's performance. Good shooting!