It is very simple. Practice, and knowing you firearm. There areBP rifles that will do the same thing. For example the Gibb's or Whitworth rifle is used to 1,000 yards.

The large bullet has something to do with it in the 45-70. But your 30-06 is very capable at the same range(and farther) if it is in the hands of a RIFLEMAN who knows how to use it. Tom.