Sharing the results of weight sorting .22 LR ammo for Benchrest 50 (BR50) - sorting two 100 samples from the same production batches: one from Lapua CenterX and another from Akah X-Trainer. Both are Made in Germany by Lapua - Center-X is a top of the line ammo costing approximatly twice as much as the low end Akah X-Trainer.
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Test results for the Center X
- the all 100 units batch is within a tight 0,2 grains precision interval (!) |
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Test results for the Akah X-Trainer show a high spread in weight
Approx. 66% can be fitted in the 0,1 grains interval of 51,5 to 51,4 |
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| A "matrix sorter" helps to keep track of groups within different weights |
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| A 0,1 grains precision digital scale |
Next steps, since the 0,2 grains precision interval as "factory default" from Lapua Center-X is considered to be "match grade", and no further sorting should be required there, will be focused on measuring rim thickness. For that I'll be using a thickness gauge by Hornady ,
http://www.hornady.com/store/Rimfire-Thickness-Gauges . I'll report about that measuring process and data on a forthcoming post.
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The Hornady thickness gauge applied to a calliper
(diagram from Hornady product manual) |
