I did some target practice with my 300prc today. I had my Magnetospeed mounted to check bullet velocity. My question or concern is about the results. I'm shooting Hornady Match 225gr 300prc, the box states that the muzzle velocity is 2810fps. I was recording anywhere from 2300 to 2900. Seems like a wide range with the SD being crazy, average was 2578fps. I will be reloading ASAP but is this variance or lack of precision common? Bright side, I was still able to hit my target at a decent distance, just want it to be more consistent.