I saw this thread this morning and clicked on it before realizing that it was started by me over 2 years ago. LOL!!!
So as an update, I ended up with a great load of RL-15 pushing the 80 gr TTSX at +/-3,180 fps and it shoots 3/4" or better if I do my part. My daughter has now killed 5 deer with this load and every one has run less than 40 yards and had good blood trails. The latest victim was a 185 lb 9 point that she dropped in it's tracks on Sat morning at about 70 yards. I have highly recommended these bullets to everyone that will listen, especially for a youth. The recoil is very low, even for a .243 and they kill way above their weight class, always exiting on broadside shots and providing blood trails.
