I've taken that exact combination to S.A. and Zim 3 times now. I use a Pelican 1750 and remove the center foam. Pack both rifles in soft cases. Bolt removed from the magazine rifle. Scope and red dot on each accordingly. Also, pack cleaning rod, spare case locks and a few assorted rifle cleaning and maintaining accessories as allowable to get the package to weigh just under 50 lbs. Has worked well for me on all trips. Although, they did manage to lose my gun case and luggage on my return trip last December. All turned out well as the gear arrived at my door 2 days later (albeit, some minor things missing from my gear bag). I was thankful to have my rifles back in hand.
Good luck with your trip.
Jody