Heart shot with the maggie, or a mild load out of the .30/30. Gives a little more room for error, I think, and is always fatal. Personally, I'd want to be very close and only shoot at standing broadside deer. One thing worse than too much noise would be wounded deer staggering around on the property. The crossbow would be a good choice, but requires a significant investment, so may not be practical unless he plans to hunt there often.
