Every .5 or half inch you lose about 40 to 50 fps! Being from NYC with all my uncle's and cusoins being well respected cop's swat, ICE , ECT . and with today's water down ammo. I choose to stick with +p loads in anything under 4inches. Yes I do agree that you will get quicker wearing . And I do agree that shot placement may be more difficult for others. In my edc I carry +p loads. I'm not worried about wear or shoot placement being a former Marine. I'm really interested in underwood extreme defender's 90gr+p. Though my family warns me to stick with what we know work's. Being from NYC that would be our tried and true speer gold dots 124gr+p and hst 124gr+p .Though im going to be ordering some ballistic dummys to test out some underwood ammo. I love the idea of a light carry round! Though with no police department's currently using them. Just not enough data for me! Though they look promising .