Some things simply can’t be explained but after now decades of airgun shooting, and a vault full of some of the best and most accurate airguns available that now or have included Skout, RAW, FX, Air Arms, Weihrauch, BSA, Walter, Daystate, Uragan, Kalibrgun, Beeman, etc, in .177, .20, .22, and .25, for whatever reason, and with much more limited pellet choices to be had, the seemingly inherent accuracy of the .20 caliber, from my 10s of thousands of pellets tested, is without question.
There also is no question that the right .22 in terms of accuracy and lethality makes the .20 come into question, but I own and have helped others on this forum acquire and tune .20 caliber Springer’s that will shoot at 50 yards and under with 75% of the available off of the shelf pcps, in terms of accuracy. I don’t know why, this is just a fact.
Below is a target from my 18 yard indoor range, typical of my .20 Weihrauch HW97’s performance. Certainly, I have some select pcps in .177, .22, and .25 that will shoot groups averaging .10” or even better at the same distance, but there are many pcps that will not shoot as well as this Springer in .20, and other 20s that have come through my hands. At 50 yards, it will shoot inside 3/4” under light wind conditions.
Finally, I am certainly not bashing the other calibers. My experience only indicates that, for whatever reason, the .20s inherently seem to be consistently more accurate.
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