Extreme spread? Or standard deviation?
Quote from: DevilsLuck on February 23, 2019, 01:47:46 PMExtreme spread? Or standard deviation?...As Keith mentioned, as your ES tightens, your SD should follow.
However, ES will tell you the vertical stringing on the target, with a larger ES meaning a greater difference between the fastest (highest POI) shot and the slowest (lowest POI) shot.... While it is true that the more shots you fire, the larger the ES will be, when applied to something like an unregulated PCP, where the velocity forms a bell-curve, it is extremely useful to determine the useful pressure range you can use to keep all your shots within the desired velocity spread.... The further the range you are shooting, the smaller the ES needs to be to limit vertical stringing to an acceptable value.... For the most part, the length of the string is limited by the ES you find acceptable.... For that reason I use ES exclusively, I never look at the SD....I'm pretty sure that is what Peter meant when he said "tighten your ES".... ie try and tune the gun, or use the appropriate pressure range, to reduce the ES to an acceptable value for the range you are shooting at.... For the most part a smaller ES is accompanied by a reduction in SD as well.... although an ES of, say 10 fps over 10 shots will have a larger SD than that same 10 fps ES over a 50 shot sample.... That is the point Scott is trying to make, I think....Bob
Thanks for the input guys. I just rebuilt my D48. But before I did I recorded a 10 shot string. I wanted to have some numbers to compare the new kit to. That is why I ask which number I should be more concerned with.
... when applied to something like an unregulated PCP, where the velocity forms a bell-curve, it is extremely useful to determine the useful pressure range you can use to keep all your shots within the desired velocity spread.......Bob
For me, if it goes in the same hole every time.
Quote from: rsterne on February 23, 2019, 10:38:31 PM... when applied to something like an unregulated PCP, where the velocity forms a bell-curve, it is extremely useful to determine the useful pressure range you can use to keep all your shots within the desired velocity spread.......BobWould the same bell curve apply to my CO2 guns to help determine the number of shots at a given temp in it's Sweet spot? Or, because CO2 is self regulating, do those guns stay flat then taper off as the gas is exhausted? I would think a Non regged HPA PCP would start high and gradually taper off but I realize that is not the case.... although I don't understand why.
.... Sorry for the side-track....