| 4seventy |
| (Sponsor) |
| 29/09/12 03:18 PM |
Re: Double of the Day
|
Quote:
What the heck is .450 2.5" on the flat of the lefthand barrel?
That would be the mark for .458 Win Mag.
The bore measures .450", (groove .458") and the case length is two and a half inches.
This is the way the Birmingham proof marks were done between 1954 and 1989.
The proofmarks of that era would also include the chamber pressure in TONS per []". (tons per square inch)
For the .458 Win Mag that would be 19.5 TONS per []".