Here's my story from my post in the exotics thread:
I used the 243 on the fallow which dressed at 158lbs (a real butterball). A 95gr NosBT / 43.5gr H414 at 3040fps. Wouldn't do it again I don't think. The bullet performed well. First shot broke the shoulders at about 50yds. Took a second shot at about the same distance from above (we were on a hill side and the deer was below us). Interestingly enough...the 2nd bullet entered where the shoulder and the neck meets and exited just behind the sternum. A real sharp angle was that shot. The 3rd shot was a finisher. Postmortem shows the 1st shot broke both shoulders and the deer ambled away, didn't run. The second shot (a top to bottom shot) deflated the lungs and the 3rd took out the heart (actually, it came out in three pieces). The bullet performed well, but, I'd like more shock that I think a larger diameter bullet would give.
I just think a heavier bullet with more diameter would work better that's all. BTW, I've shot three fallow with this load as well as a couple of exotics sheep and goats. I can't say I'm all that convinced that I'd use it again on animals over 100 or 125lbs. I originally got it as a javalina gun and wanted to test it on other animals. Power to ya if you are comfortable with it...I kinda think of it like I do about using a 270 on elk. It will do the job, but, if you can't elk hunt very often and you have only a hunt once in while for a bull, do you really want to use a 270??
Just the way I think...take it with a grain of salt.