I'm not sure I understand your question ..... but is it a good drill, yes ( with any caliber ).
2 in the chest , one in the nuts .... is one of my favorites too. Or two in the nuts - and he'll wish you shot him in the head / or will beg you to shoot him in the head ....( sorry, couldn't resist ).
Double and Triple taps - in any combination are always good drills in my opinion. Another one I like is double tap, reload, double tap, reload, double tap, reload ( until you go thru 12 rounds ) and record your time. If you're outside the A zone on an IPSC target at 21 feet ( record no score ) and do it again. My goal is to run this drill 3 times ( around my average time ) and we're all different on time - with all hits on A zone. Then I move onto something different.