I have been admonished for "pumping up air guns". I am guilty as charged. Facts and common sense leave me no choice.
Within reasonable constraints, there is no cheaper way to achieve excellent accuracy than with a quality air gun. That will upset those who embrace cast bullets as the path to inexpensive trigger time, but it is reality.
The vast majority of my plinking is done at 50 yards or less. I suspect that holds for most folks. My PCP Huntsman shoots under .75" at that range at a total shooting cost of $30/k (including pellets, amortization of the tank over 15 years, and air fills at a scuba shop). That is based on 5000 rounds a year. Plan on investing $1700 (gun $1100 and tank $600) to get that level of accuracy. If 1" groups, or a bit more, are good enough, the DAR does that for under $400 for the gun. There are others just as good...maybe better? My guns are three years old and things change quickly wrt air guns. I have not kept up as I am satisfied with what I have.
I still shoot cast bullets in 9mm's and .38/.357's (pistols and carbines) but not as many. During the first .22 LR crisis, I was shooting over 15k cast bulleted 9mm's and .38 Spl's per year for less than the cost of .22's. Those days are gone for the foreseeable future. With what I now know, I will never go back to doing most of my plinking with cast bullets. I am a shooter. I have no great love for casting, sizing/lubing, policing/sorting/cleaning cases, or reloading unless I am saving money.
With today's component costs, it seemed to require a lot of mental gymnastics to justify casting and reloading to save money to plink. Then I had an epiphany. It may not be about "cheap shooting" for everyone....it could be about cheap reloading/casting. Some people shoot to reload and cast!!! Folks wired that way (and BTW that is not "wrong", just different) will despise air guns. They enjoy the process as much or more than shooting. If that is you, air guns are going to be disappointing and frustrating. Disappointing because you will miss the "fun" of the process...finding alloy, modifying it, taking an ingot and making bullets, lubing/sizing, cleaning grungy cases to get shinny brass, prepping brass, load development and reloading. Frustrating because you will be hard pressed to beat the accuracy of an air gun at 50 yards regardless of how much care you take with cast loads. I believe there are a handful of folks on this site who could do it, but anyone can buy a PCP that is capable of 3/4" (or better) groups at 50 yards...if they can shoot. Which brings up another rabbit hole...some folks are not capable. I find myself in that less than capable group.
I have the same gun as NSB and he shoots 1/4" smaller groups. I can do as well or better than him at times, but I am not consistent. Air guns groups are more affected by wind and that takes a different skill set than trigger/breath control, consistent stock weld, and follow through. It is good skill and you do not need to shoot at 300+ yards with a centerfire to practice it. Air guns do it cheaply.
BTW, my current "leaning next to the door" rifle for dealing with four legged varmints (I live rurally) is a 10/22. It is not as accurate as the PCP's but it has more power, range and is less affected by wind. I love PCP's for what they do, but they do not do everything well.
I believe in using the right tool for the job. Air guns rock for cheap trigger time; .22 LR is better for small game; lead bullets in the pistol caliber rounds work well for practicing; pistol rounds for "serious" work (in my calibers) call for high end jacketed bullets; the modern CF rifle works best with jacketed bullets. KISS
I used to shoot over 15k cast bullets a year. That has changed. I may shoot 3000 cast bullets this year. Cast bullets will always be part of my "habit" when they make sense.