4570 ,
A few hundred to multiple thousands of USD depending on EXACTLY what you have.
The 45/70 is best kept in the 0-150 yard range out of a lever gun.
The best answer I can give you is to post at http://www.trapdoorcollector.com/
Depends on if you are talking about military or civilian and what "strongest" means to you.
4570 g = 4570000 mg
There are 1000 millimetres in one metre. Therefore, 4570 millimetres is equal to 4570/1000 = 4.57 metres.
0
0.0026
Depends on the exact weapon
Maker and price
Assuming that milemmeters is really millimetres, 4570 mm = 4.57 metres.