Plain and simple basic would be a pro chrono by competition electronics. On my second. First one died by 45 Colt. You can spend more from there.
Another vote for this unit. I havent killed mine yet but did blow the OEM Bluetooth sending unit right off the port side! On Bluetooth #2 now.
I'll tell you a 60 grain Ballistic tip will do a number @ 15' out of a 5.56mm
