Remind him that the 45/70 was used to kill many a buffalo...

If he wants full penetration tell him to shoot either the 250 Barnes all copper or the 300...with 90-110 grains of powder, its more than you need for whitetails...I shot the 300 for years and always got a pass through...

I have shot the 250 SST for 3-4 years now with 90 grains of Goex FFF and have had pass throughs on the 7-8 whitetail that I have used it for.