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Is a CZ coach shotgun's action strong enough to be converted into a .577 nitro double rifle ... What modern SxS shotguns are strong enough to be converted to this caliber.....In wake of this information, I recently purchased ... .500 bpe jones underlever double that was bored to 20 bore... Before I move forward with this process could anyone tell me if this action is strong enough to be chambered in .375 H&H?

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Not large enough action in height and width for a .577; you need a 10 gauge action for that. Plus you need a donor action that has striker discs. Large frame 10 gauge Spanish shotguns are inexpensive to buy. For such a conversion, the action must be large enough for the chamber wall thickness that is required for the particular cartridge case.

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