Corbon's DPX is by far the softest .40 round I've come across. It shoots very accurately out of my M&P40c and the terminal ballistics look great (penetration and expansion). It's not easy on the wallet though, about $28/20. But as the saying goes, how much is your life worth?
As for practice rounds, I haven't been able to tell much difference in most loads.
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Fast is fine;accurate is final
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