150 grain for the .308; 95 or 100 grain .243. I can't tell you about the .30-30.
This is only a 'practice shoot' to see how she handles the recoil. So save yourself some money and buy one box of Remington Core-Lokt soft-points for each caliber. It is inexpensive, and usually shoots fairly well through most guns. And when it goes through a deer, the Core-Lokt will perform just as well as the more expensive rounds that you're talking about. You can try out different brands and loads of ammo after she has picked the caliber.
Notice how I said, "after SHE has picked the caliber."
Don't let anyone pressure her to pick one round over the other. If she says she is most comfortable with the .243, then that should be the choice.
Better to have an accurate shot with a .243 than a flinch from a 308.