If he's wanting something really special, it might be a good thing to go with a Hartford in 44-77, the rifle and cartridge that started the road to fame for the Sharps rifle co.
Cases are readily available from Captec, bullet moulds are easily had from Buffalo Arms, Brooks, and Accurate moulds.
He can get that for his second one.
I'm in the group calling for a 30" octagon barrel, Hartford Model, #3, or Roughrider in .45-70, aka 45-2.1", steel shotgun buttplate.
Easier to get components, much more data out there for a beginner, and easier to get to shoot quicker.
Just my $0.02
Ed