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Thanks for answering.
I feel like I bought a BP rifle instead of a Nitro!
The only mark on the barrels flats is 450 Ex.

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The rifle is almost new, perfectly on face, with gorgerous woods. It has 26 inches barrels, full rib with one standing and one folding leaves, splinter forend.

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Serial number is 13082. Weight 9 pounds.

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I bought it used from a gunsmith in Paris with 60 cartridges (A Square) .450 NE.
I tried these and accuracy was very good at 70 yards. But primers were too flat for my tast!
Do you think a BP rifle would have stand such loads?

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Yikes! Sounds like the gunsmith didn't know very much. Never fire any ammunition that happens to come with an older double rifle like that until you're certain that it is appropriate for the rifle. Operating chamber pressure of the .450 Nitro Express is much, much higher than that of the .450 Black Powder Express cartridge that your rifle was proved for. Shooting Nitro Express ammunition in it is seriously unsafe, as well as abusive to the rifle. BTW, excessive pressure with A-Square ammunition isn't unusual.

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"Serious rifles have two barrels, everything else just burns gunpowder."

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