Velocity spread

[Timl]

Is it normal to get extreme spreads of 100 fps when hand loading. Or is this a little high?

 

[roggom]

Re: Velocity spread

I would say that is on the high side. Depends on how you are measuring your powder, seating, brass type, mixed headstamp, and a bunch of other variables.

Put your numbers in here and calc the standard deviation

http://easycalculation.com/statistics/standard-deviation.php

 

[427Cobra]

Re: Velocity spread

100 is way too high, Tim could you please explain your loading process so we can help you lower it, also what chronograph are you using, if its a Chrony that might be your problem.

 

[Timl]

Re: Velocity spread

After doing some checking - I'm sure it is the chronograph and it's accuracy causing the velocity spread.
Thanks

 

[Aimsmall55]

Re: Velocity spread

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Timl</div><div class="ubbcode-body">After doing some checking - I'm sure it is the chronograph and it's accuracy causing the velocity spread.
Thanks</div></div>

If its a large rifle try the cci br2. My es went wayyy down but I lost about 30 fps. But I shoot in matches where Es & sd are a big deal. And 30 fps isn't a big deal