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In my opinion the idea of a tapered case being less likely to cause extraction problems is incorrect, especially in double rifles.
Wrong. The British flanged nitro expresses have proven it to be true for 110 years, especially in double rifles, which don't have the extraction power that bolt rifles do. The tapered case is why they work so well.
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with .375 H&H barrels fitted, had real extraction problems.
Of course. It isn't a double rifle cartridge, and the tapered case alone can't make it one. Trying to make the case that tapered cases don't extract more easily in double rifles by using an example of a high pressure belted rimless magnum that wasn't intended for double rifles is silly.
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