Re: Primer Batch Difference
Posted: Sun Mar 22, 2015 7:53 pm
Barry,
I inadvertently left a digit off.
The carton of 1000 Fed 210GM primers that I sorted weighed from 0.356 grams to 0.363 grams.
I sorted them into 0.001 gram lots....0.356 grams, 0.357 grams, 0.358 grams....up to 0.363 grams.
With the And120i scales it is actually quite easy to sort to 0.001 gram
Using these Magnetic Force Restoration digital scales, it is easier and more precise to weigh in grams.
It is because of the "division" possible with these highly accurate scales. Their "resolution" is 0.001 grams, or 0.2 grains
Because the AnD120i has a maximum weight capacity of 123 grams, and is in graduations of 0.001 grams, it s weight range has 123 divided by 0.001 = 123,000 divisions.
Its maximum weight in grains is 1898 grains, so If I left it in Grains, it would only have 1898 divided by 0.02 (it's resolution is 0.02 grains) =94,100 divisions.
So with effectively one third MORE divisions over the same weight range, (123000 compared to 94100) it is basically one third more precise to weigh in grams....so I do.
The distribution is very much a typical "bell curve", with approx 80% falling between 0.359 grams and 0.361 gr, so I load and shoot them in batches.
The rest ......maybe 10% at the lower end and 10% at the upper end, get used for Club days and breaking in barrels etc.
For some, it may seem like an insane waste of time, but to me it is just part of loading the most consistent ammunition that I am capable of loading.
I should add that I only get this serious for OPMs and Queens !
Cases are weight ranged and batched. Bullets are weight ranged and batched, then pointed. Powder charges are weighed to 0.02 grains. One of these days when I learn enough about the fine art of long range shooting, I hope to be competitive
I inadvertently left a digit off.
The carton of 1000 Fed 210GM primers that I sorted weighed from 0.356 grams to 0.363 grams.
I sorted them into 0.001 gram lots....0.356 grams, 0.357 grams, 0.358 grams....up to 0.363 grams.
With the And120i scales it is actually quite easy to sort to 0.001 gram
Using these Magnetic Force Restoration digital scales, it is easier and more precise to weigh in grams.
It is because of the "division" possible with these highly accurate scales. Their "resolution" is 0.001 grams, or 0.2 grains
Because the AnD120i has a maximum weight capacity of 123 grams, and is in graduations of 0.001 grams, it s weight range has 123 divided by 0.001 = 123,000 divisions.
Its maximum weight in grains is 1898 grains, so If I left it in Grains, it would only have 1898 divided by 0.02 (it's resolution is 0.02 grains) =94,100 divisions.
So with effectively one third MORE divisions over the same weight range, (123000 compared to 94100) it is basically one third more precise to weigh in grams....so I do.
The distribution is very much a typical "bell curve", with approx 80% falling between 0.359 grams and 0.361 gr, so I load and shoot them in batches.
The rest ......maybe 10% at the lower end and 10% at the upper end, get used for Club days and breaking in barrels etc.
For some, it may seem like an insane waste of time, but to me it is just part of loading the most consistent ammunition that I am capable of loading.
I should add that I only get this serious for OPMs and Queens !
Cases are weight ranged and batched. Bullets are weight ranged and batched, then pointed. Powder charges are weighed to 0.02 grains. One of these days when I learn enough about the fine art of long range shooting, I hope to be competitive