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The 173-grain round nosed bullets need a longer throat than the concise 140- and 150-grain spitzer bullets require, so the H.V. throat was shortened to deliver the best accuracy with the lighter bullets. If you have a H.V. chamber, you will find that the 173-grain bullets won’t chamber in your rifle (or at least shouldn’t, if the chamber was cut properly).

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Not all .275 Rigby chambers are of the High Velocity variant, but if you are shopping for a .275, be sure and verify which chambering it is. I

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