| 400NitroExpress |
| (.400 member) |
| 21/07/08 01:35 PM |
Re: Identifying a chambering -Thomas Turner BP double
|
Proof marks for British rifles were not very specific to the cartridge case until the rules of 1925. These are pre-1887 Birmingham marks and the "56" is the bore in gauge, which indicates a .450. Chamber dimensions are strongly suggestive of a .500/.450 No. 1 Express.