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I assume the lower pressure handling capability of BPE rifles is due to the strength of steel in the receiver and barrels, so that one cannot convert a BPE rifle to handle nitro cartridges in the same caliber just by adding a new set of barrels. That is, the relative weakness of the receiver steel cannot be overcome.

Is that a fair statement or does the truth lie somewhere in between?

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No not entirely true. The steel used and the design both may be strong enough for Nitro, the gun was just built for and proofed to black powder standards. Depends on the gun.

The custom is to have the gun proofed for Nitro if it was designed and constructed correctly.

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DD, Ret.

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