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Measure your cylinder throats – if they measure 452 or 453 then the 452 is the proper sized bullet. If your throats are 454 to 456 then the 454 bullet should be used.
Utilizing a 454 sized bullet in a revolver with 452 throats is sorta counterproductive, as your cylinder throats will resize your 454 bullet down to 452. Doesn't hurt anything except maybe accuracy.
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