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Why? A 155grain .40S&W has the same power of a 158grain .357mag
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Sure it comes close in velocity but the 357Mag has it beat in penetration. You can load or buy from DT, a 158gr. 357Mag load that does 1400+fps. The 125gr. can be pushed to 1600-1700fps. In reality most of the 155gr. 40S&W tend to be in the 1150-1180fps range and those are hot 40S&W loads, while the 158gr. 357Mag loads tend to be 1200-1220fps range plus the benefit of better penetration. These are merely standard power loads and not even on the hot side. You can even hunt deer with 158gr. 357Mag loads.