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 .45 CALIBER PELLETS…"Weight-Variations" Test

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Marty
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PostSubject: .45 CALIBER PELLETS…"Weight-Variations" Test   March 6th 2010, 7:38 pm



Pictured Left to Right: Pyrodex 30 grain Pellet, 50 grain Triple Se7en Pellet, 50 grain Pyrodex Pellet
NOTE: The Pellets are sold as grain volume equivalents.

I decided to do a little “quality control” check of my own on some .45 caliber Pellets I have to see how much variation in weight there is among individual pellets. I randomly grabbed 25 pellets of the Pyrodex .45 caliber 30 grain Pellets, 25 of the Pyrodex .45 caliber 50 grain Pellets, and 25 of the Triple Se7en .45 caliber 50 grain Pellets. I used a Salter Brecknell Digital Reloading Scale (Model CB50) to weigh the pellets which was calibrated before weighing each of the three groups of Pellets. Accuracy of the scale is (+/-) 0.3 grains. Here were the results:

PYRODEX 30 Grain Pellets: Average(mean) of 25 = 25.4 grains
* Standard Deviation(SD) = 0.552 grains
Variance of SD = 0.305
Lowest Value = 23.9 grains
Highest Value = 26.2 grains
High-Low Spread = 2.3 grains


PYRODEX 50 Grain Pellets: Average(mean) of 25 = 40.6 grains
* Standard Deviation(SD) = 0.444 grains
Variance of SD = 0.197
Lowest Value = 39.6 grains
Highest Value = 41.4 grains
High-Low Spread = 1.8 grains


TRIPLE SE7EN 50 Grain Pellets: Average(mean) of 25 = 32.4 grains
* Standard Deviation(SD) = 0.296 grains
Variance of SD = 0.088
Lowest Value = 31.8 grains
Highest Value = 32.9 grains
High-Low Spread = 1.1 grains


The 30 grain pellets showed the greatest high-Low Spread. These pellets are sold in 100-count quantities, and are packed “loose” in their container. Both 50 grain pellets are sold in 50-count quantities, but each individual pellet in both containers has a separate compartment within the container itself to minimize movement.

* DEFINITIONS:(SD): Shows how much “variation” there is from the "average" (mean). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data are spread out over a large range of values. The Standard Deviation(SD) is simply derived from taking the square root of the Variance. In the math world of statistics, squaring makes each term positive(+) so that values above mean do not cancel values below the mean.


Last edited by Marty on March 8th 2010, 3:17 pm; edited 2 times in total (Reason for editing : added Definitions)
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Rick

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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   March 7th 2010, 8:03 am

That is an interesting post to say the least, nice job.

I went to Cabela's yesterday to get that scale I decided on and they didn't have it. I might have to order it online.

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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   March 7th 2010, 8:16 am

Cool Surprised

Thanks for the info Exclamation Exclamation Always helpfull when trying out new powders or pellets cheers cheers

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ceader savage



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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   June 15th 2010, 7:44 am

yes but there to weight 50 gr not 40?
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Marty
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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   June 15th 2010, 7:43 pm

@ceader savage wrote:
yes but there to weight 50 gr not 40?

The 50 grain pellets are sold as 50 grain VOLUME equivalents. I "weighed" them to see if there were any variations between individual pellets...hence the lower grain numerical values by "weight" in grains.
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falcon

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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   September 24th 2013, 3:40 pm

Marty: Thanks for the good information.
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OldMtnMan

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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   September 24th 2013, 3:48 pm

It took you 3 years to say thanks?  clown

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PostSubject: Re: .45 CALIBER PELLETS…"Weight-Variations" Test   September 24th 2013, 5:20 pm

Marty, you must be an engineer to care enough to do all those measurements. Razz

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