Goodness gracious, all the deer I have took with a 243, and people are still worried that its not enough gun. If he can't take a deer with a 243, I don't think a 30-06 is going to help him.

Anything over a 243 is good enough for deer but that's the lightest I would go. Personally I'd have gone with a 270.

JMO but the .243 WSSM is plently big enough unless your buddy can't hit a pie plate at 100yards, and if he can't not sure bigger would help anyway.

you would only want to use the 100 Gr IMHO they will enough thump to GetR done

Ive seen some deer taken with a .243 but those were just couse deer. He should have went a little bigger like a 7mm WSM.

WHAT!! a little bigger? 7WSM? Best study your periodic table of ballistics!