@L.Leon Some strong words from somebody who hasn't ever experienced a .20. And that's the message it seems like
@Long_Gun_Dallas was trying to convey. Easy for .20 to not be popular with their limited availability.
My .20 journey began about 6 years ago, at least in part, by reading
@Motorhead talk about its ballistics superiority in the game of field target, at just under 20fpe. I've now had a total of 4 different .20 guns and can confirm that the .20/13.73 has the highest BC of any pellet under 20fpe. And in the 30fpe realm, the .20/15.89 has the highest BC of any pellet currently in production.
3 of the 4 guns required me to pay a machinist to make it happen. "The market has spoken" is on the manufacturer side, not the shooter side. The .20 would be more popular if it was more available and more people could experience for themselves that it is simply better than current .177 and .22 pellets in the 20 and 30fpe ranges.
My opinion is coming from someone who chose to compete with a .20 at American Field Target at EBR last year, and placed in the money with that .20. The lowly .20, at only 29fpe, outscored a whole lotta .22s that were putting out roughly double the fpe. I chose the JSB .20 Heavy because it has greater precision than the most common long range .22 pellet, the Monster RD. Or at least it did with the guns and pellet batches I had available to me at the time. Now, go to the .25/34 and they'll beat the tar out of the .20/15.89. Those .25/34s don't seem to have the issues that the .22/25.4 MRDs do.
Last summer I was consistently exterminating prairie dogs with the .20/15.89 out to 150yards, and witnessed by more than one individual, not just claiming to have done so. I've dropped starlings and euro doves out of the tops of the old dead cottonwoods behind my house at 160 yards with that .20/15.89, and not just a few times. I could go on and on with personal experiences of what the .20 is capable of.
At 20 and 30fpe, the .20 is simply better than a .177 and .22, that are also putting out 20 and 30fpe. And I'm willing to stand behind that in any sort of comparison somebody would like to see or do.
I would love to have a .22/60fpe pellet that shoots as accurately at long range as the .20 Heavy does at 30fpe, and does so as consistently, but the pellet manufacturers are struggling in that regard.
I'm one of the .20s biggest supporters, and that's b/c I've seen what it can do with my own eyes. More shooters would feel the same if more manufacturers were making .20s.