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Neat old gun. I can't read Polish, but I'm sketpical that the gun is a 450 Nitro Express, or at least that it was one when new. I suspect its a 450 Black Powder Express or that its a Nitro-for-Black loading based on the size and age of the hammer rifle.
Could we see the proof marks on the barrel flats?
.450 Nitro didn't exist until 1898, while the listing seems to date the rifle at 1884 originally. I would say .450 BPE for sure, if so. Maybe it was rebarreled or reproofed, though. I can gather the barrels are made of Krupp steel and the rifle itself by Joh. Springer's Erben out of Vienna. Prestigious gunmaker, them. But without proofs I doubt it's .450NE regardless of what OP says. Maybe nitro-for-black would be alright but that's just smokeless carefully loaded into the slightly-shorter BPE casing, not a completely different cartridge. More pictures would be welcome either way, it looks a handsome gun.Neat old gun. I can't read Polish, but I'm sketpical that the gun is a 450 Nitro Express, or at least that it was one when new. I suspect its a 450 Black Powder Express or that its a Nitro-for-Black loading based on the size and age of the hammer rifle.
Could we see the proof marks on the barrel flats?
1884 rok, Doppel Express .450 Lang. Po elaboracji kordytem w 1898 roku = .450 NE.
Yeah I translated that and figured there might be some misunderstanding about smokeless-for-black in a BPE versus the much later (and slightly longer-cased) NE, so I decided to try the main text too.This roughly translates: 1884, Double Express .450 Lang. After elaboration with cordite in 1898 = .450 NE.
Unfortunately, that isn't a true statement per se. It sounds like "elaboration" from the polish means it was "re-proofed" for Nitro cellulous powder after 1898. At what service pressure, only the subsequent proof marks would show, but probably at Nitro-For-Black identical pressures since the gun's barrels and stock were not built to endure NE force.
It's sort of a moot academic discussion at the asking price of 30,000 $, unless that price was Polish Zloty which translates to about $7150 USD.