| 470Rigby |
| (.333 member) |
| 25/10/04 04:17 PM |
|
Re: Rigby 450 Nitro Double For Sale
|
500N
In reply to:
Why do you say "GUILTY" - I would call it an obvious thing to do
Rechambering a .450 NE to .470 will reduce chamber wall thickness by about .014" - not much you might say - but that is equal the the total wall thickness in some shotguns. Going from a chamber pressure of 17 tpsi for the .450 to 14 tpsi for the .470, combined may mitigate the consequences of reducing wall thickness, but in my observations, .470's usually had a more pronounced taper just forward of the breech, whereas .450's usually have less taper - presumably this was done for a reason.
Remember, British Proof is not an ultimate test of burst pressure - and says nothing about strength reserves.
In reply to:
Why do you say "steel technology pre-WW1 was a bit "iffY"?"
Technology transfer from the military arms industries, particularly from Germany after WW1 was rapid, and steel quality, both for barrels and actions of sporting rifles and guns did improve.
In reply to:
I don't think the market has enough of an
undertsanding of the English gun making trade 1900 - 1930 to think along those lines
Beg to differ. By way of explanation - an aquaintance, fairly new to the double rifle scene, took himself of to the US about 10 years back and bought a Purdey .470 from a high profile dealer over there, at what he thought to be something of a bargain price. The gun had been re-bored from .450, and had been sitting for some time on the dealers rack, unsold and unloved by what were obviously some fairly discriminating buyers over there.
As you would know, originality is an issue and even if modifications are technically sound, the lack of it will still be reflected in the price.
As for;
In reply to:
can you send me a PM to confirm ident ?
