There’s some old-school lore among bolt-action rimfire shooters that weight sorting bulk 22LR ammo is almost as good as buying Match Grade ammo. I put that theory to the test, partially out of curiosity and partly out of necessity. Since the COVID pandemic, Match Grade rimfire ammo has been impossible for me to find locally and what few boxes I could find were outrageously priced.
Match Grade rimfire ammo differs to cheap bulk ammo primarily in the quality control testing of the product. Many manufacturers do not make “practice” or “plinking’ grade ammo. Instead really only make Match ammo but based on the quality control testing of the batches, they reclassify and repackage the rejects lower grade varieties (Club, Target, Rifle, etc.). This quality control includes visually inspecting the uniformity of the cartridge as well as weighing them. Consistency in ballistic performance comes from consistency of the bullet cartridge.
I took the more mediocre 22LR ammo I had in stock, which was a loose box of Federal Champion “Blue Box”. Using a digital scale, I measure the weight in grains of each 22LR cartridge I would pull out of the box. I sorted the measured cartridges into groups: 49.8gr-51.2gr and under, 51.3-51.5gr, and 51.6gr-5.19gr. Any cartridges outside of these 3 batches was thrown in the “junk” pile; about 1 in 30 fell.
I took 50 rounds of the middle-weight batch (~51.4gr) to the range along with the new box of Federal Champion. Using my CZ-457 as the test bed, I set up a target downrange at 100yrds. I pasted up eight, 5/8″ sticker dots as my targets. I would fire 20 shots, 5 at shots at each of the 4 targets in each group.
The first group would be my weight-sorted batch. On second row of dots would use random bullets pulled from the Federal blue box. I chose to shoot the random batch 2nd to afford it the best opportunity possible. Compared to the Weight Sorted batch, the barrel would be well seasoned and I would have been warmed up from shooting the 1st batch.
Inspecting the target afterwards, my first impression was that there wasn’t a huge difference between the two rows. But after taking a photo and crunching the numbers using my phone’s Range Buddy app, the number told a different story. The Weight Sorted batch scored an average of 1.25 MOA whilst the Random Batch scored an average of 1.83 MOA. That 0.58 MOA difference that’s an almost 60% improvement!
But in the real world 0.6 MOA, hardly seems worth the time and effort to measure each 22LR cartridge. Certainly when shooting at a competition, every little bit helps. In one of my recent matches the difference between my 1st place win and 2nd place was only 3 points.
You can try it yourself to see how much a difference weight sorting is to you. You’ll need a precision digital scale that can measure to the nearest 0.01g . I used this one: https://amzn.to/3s8NG4j
