Another .450 Martini-Henry Sub-Cal Cartridge

This is another .450 MH sub-cal similar to ArmourerJim’s but without the fancy base lever.

It is unmarked steel with the early swelled base style and is not rifled.
It came from India years ago.
75.2mm overall. 6.2mm primer?. 3.9mm bore so will take a 4mm BB shot?