Roger that sticks, I wasnt trying to be too critical, heck youre shooting much farther and better than I am (am building a 1000 yd rifle hopefully), and yes on the 0.05 gr for a +/- 0.1-er. I have read some guys whom I respect saying they have some sds in the 2s and Ess in the 5s, they have found a real good combo and rather flat node. Other nodes or load combos might not be as tight, for sure. For me right now I have a +/- 0.1 scale, but if I were going to try for tighter I would look at a 0.02 gr scale if its truly that.
it is quite probable that your line voltage is pretty noisy, at those levels of accuracy. If youve ever put an oscope on the 110 volt deadly shipmate (what we used to call it in the Nav) you would see lots of hi frequency spikes and such. Some of those spikes may be too fast to cause anything on your scale but then again, maybe they would. And who knows how long the noise filter ckts in the scales circuit board may last or how good they are. Stray RF from overhead lights, same deal. Definitely frustrating. But most home-grown electronic remedies, IMO, its hard to know how effective they really are without test equipment to measure the before and after. I do hope you find another steady scale, if that one model 2 isnt consistent enough.
one other math suggestion... Id look at the std deviations of your strings, then think + or - 2 or 3x of that nbr... depending on how fine you want to tune things. For a decent size string, say 10 shot sample, an sd of 5 means a 95% probability that a shot will be within +/- 10 fps of the avg, thats 2 sd plus or minus, total spread of 20 fps. For a tighter MV spread look for sd under 5. So your shot will go +10 fps from avg, either up or down on the target hit for the avg mv. SD IMO is more meaningful to me with decent sample sizes, than es.
o yeah, one other ps... those sd/es numbers from your 3-shot strings/ 2018, I wouldn't put a lot of weight in them. 3 shots might give you a ballpark but not anything exact enough to make conclusions from. Not saying there might not be some deviations that big, just that 3-shot strings aren't really enough to lead you to those conclusions.
it is quite probable that your line voltage is pretty noisy, at those levels of accuracy. If youve ever put an oscope on the 110 volt deadly shipmate (what we used to call it in the Nav) you would see lots of hi frequency spikes and such. Some of those spikes may be too fast to cause anything on your scale but then again, maybe they would. And who knows how long the noise filter ckts in the scales circuit board may last or how good they are. Stray RF from overhead lights, same deal. Definitely frustrating. But most home-grown electronic remedies, IMO, its hard to know how effective they really are without test equipment to measure the before and after. I do hope you find another steady scale, if that one model 2 isnt consistent enough.
one other math suggestion... Id look at the std deviations of your strings, then think + or - 2 or 3x of that nbr... depending on how fine you want to tune things. For a decent size string, say 10 shot sample, an sd of 5 means a 95% probability that a shot will be within +/- 10 fps of the avg, thats 2 sd plus or minus, total spread of 20 fps. For a tighter MV spread look for sd under 5. So your shot will go +10 fps from avg, either up or down on the target hit for the avg mv. SD IMO is more meaningful to me with decent sample sizes, than es.
o yeah, one other ps... those sd/es numbers from your 3-shot strings/ 2018, I wouldn't put a lot of weight in them. 3 shots might give you a ballpark but not anything exact enough to make conclusions from. Not saying there might not be some deviations that big, just that 3-shot strings aren't really enough to lead you to those conclusions.
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