FX Tuning Question

[Zebra13]

Gents,

Quick question…does a good tune equal a low standard deviation? Or, putting it a different way, does a low standard deviation equal a good tune?

Tuning a .25 caliber M3 and it got me to wondering. Numbers are below. Target velocity was 890 with the 34 grain JSB.

Thanks!
Justin

 

[Dairyboy]

I would consider that a good tune yes. But where the rubber hits the road to really prove said good tune is on target.

 

[elh0102]

Statistics is not my specialty, but I'll offer an opinion. Standard deviation, I think, is the measure of how much a set of values differs from the mean, an indicator of consistency. I have had some poorly tuned rifles display very consistent numbers. In some cases they were loud, and shot count was disappointing. In other words, they were inefficient. So, my answer, a well tuned rifle, absent any mechanical issues, should show a low SD. But so might a poorly tuned rifle, although probably for a shorter shot string.

 

[Zebra13]

Dairyboy,

Agreed. The gun is shooting very well.

The settings for the Impact if anybody is curious are:

First reg: 160
Second reg: 103
Macro: 16
Micro: 4
Valve: .401

Justin