Ok folks, being new to this game I was wondering what type of variations in speed are normal etc. Im playing with this used .300 WinMag Sendaro using several bullets from 168gr to 210gr. Powders have been Reloader 22 and 25 so far. I have used the chrono, but im workin in the dark here. I have no data to benchmark my results against. Could you guys chime in and give me some examples of your standard deviations and extreme spreads etc? So I can see how my stuff is stacking up.