What weight variance is acceptable

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Keyman62421

Keyman62421

Member
Feb 24, 2017
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Claremont, Illinois, 62421 United States
I just weighed a tin of 350 JSB 25 Cal heavy 25.39 DIABOLO
​These were previously washed and dried.

​I accepted all pellets from 25.2-25.6 25.4 being optimum. the majority were 25.4
​However I have 65 pellets from that 1 tin that are in access of .4g deviation and as much as 1g.. from 24.6 to 26.4

​That's pretty harsh for high priced premium pellets .
​what do you feel is the acceptable variance. maybe I'm being to strict
​The reason I'm going through this is to try to get some accuracy from my Impact. 
​I went through my entire power wheel today and finally got pellet on pellet @25yds. on 1 (850=878 fps) and 2(902- 915psi) 
​still with an occasional FLIER. maybe only 1/4" or maybe more. but still an unexplained flier. I think these weight differences would explain it.
​Someone with more experience than this newbie before you , please enlighten me. correct me or tell me I'm nuts it's all okay
 
Hi keyman if you have a broken PCP, you can not make it shoot straight even if you had all pellets with exactly same weight.
thats my personal experience. it was a different brand, but you'd better know that. The pellet weight is not the most critical factor

there was a thread about the 33.9s yesterday, basically I have taken the time and entered all the weights into excel, looked at the =STDEV(of the whole column) then i calculated the AVERAGE(of the whole column)

the %RSD (percentage of relative standard deviation) what is the sigma(standard deviation) devided by the average and times 100 was 0.9 in %s,
pellets were 0.3grain up and down (standard deviation) around a slighly low 33.7average (does not matter really it can be an offset error on the balances) and most importantly the %RSD the reproducibility was 0.9% which is FANTASTIC.

not sure why the original poster deleted or moved the thread?

those pellets were statistically highly selected, very few outside of a narrow band.
you can calculate yours easily. specs are 5%

if your gun wont group, have it fixed. if it is shooting great, to improve PRECISION you can sellect if you like only one weight you can reliably identify but then you will have very high number of rejects.
it is up to you where you set your own personal criterion.
 
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