Not sure why you offered to make up some rounds for your friend other than trying to be a nice guy (most of my shooting buddies reload). I have a 7600 in 30-06 and I would not make any rounds for it unless they were factory spec. I would full length resize, gauge the case for headspace and shoulder and take it to +/- 0.000. Make up two dummy rounds (no powder or primer) and have him fuction them in his 7400 manually to insure fit and function.
Unless you have the rifle to try the rounds in, it would be a crap shoot to tell if eveything is working right. Once you know that the cases are going to full battery and headspacing correctly you can load away.
Si vis pacem, para bellum