I have two myself
DRice.72,
Excellent idea in your original post.
Two things you cannot do with an air gun (pistol or rifle) is double taps and recoil recovery. I think CO2 guns can do double taps, but I don't have one of those and I don't like to pay for air and power fall-off as the CO2 cylinder empties bothers me (though, the better quality guns have pressure regulators that maintain even pressure until the very end of the CO2).
I believe spring-air guns to be inherently more accurate than single-pump guns, but I could be wrong and the quality of manufacture would change things. Take a look at the airguns used in the Olympics and in other competitions. Multi-pump guns would be more powerful, but tend to be less accurate than the others.
I suggest you not lust for the power of a multi-pump gun. You are practicing and target shooting, not hunting. Accuracy is what you want. So, don't scrimp. Get a good quality target air gun, for which you could pay as much as any decent 22 rimfire, but your ammo costs will be WAY down and your practice time will be WAY up.
.177 caliber guns often can use both BBs and lead pellets. .22 caliber guns generally only use lead pellets (I know of no one making .22 caliber BBs)
I know of at least one person (on TFL, but I don't remember who) using an Airsoft pistol for practice. I don't know how accurate Airsoft guns are, but I can see the value for "quick-draw" or "presentation" practice. If they are accurate, they could be even safer and just as practical as guns powered by air or CO2.
I would use my airguns for practice in the house (I have about 30 feet of hallway with a door to the garage at the far end where a pellet or BB trap would be easy to keep), but for three things. 1) I have a couple of pets who undoubtedly would endanger themselves unless I locked them up. 2) When I practice shooting, I like the noise and company at the range. 3) I always use a variety of calibers, 22 RF (always) and, depending on my mood, a selection from my centerfires.
For indoor use, a 22 RF gun can be pressed into service, but noise WILL be a factor. Even 22 Shorts require ear protection and can be heard outside of most homes. CB Caps might be quiet enough (the sort of thing used in arcade shooting; do they still do that?)
I don't often suggest airguns, CO2 guns or Airsoft guns for shooters looking for their first gun or for a practice gun because most are already focused on something that uses gunpowder. So, I figure such a suggestion would fall on deaf ears.
Daisy (the BB gun company) made a laser device a while ago. The two-part system consisted of cartridges with batteries and a laser inside the cartridge. When struck by a firing pin, the cartridge would emit a single pulse of laser light out the front.
The second part of the system was a target that would detect that pulse and beep or flash to tell you if you hit the target or not. Worked well in a revolver (especially since you did not have to reload, no matter how many times you went around the cylinder, until the batteries were dead), but, of course, the cartridges could not cycle the action on a semiautomatic. Not so bad with a double-action pistol, but a real drag with Glock-type triggers and slightly inconvenient with a single-action semiautomatic.
In theory (since, I believe, there was no barrel alignment feature) accuracy was limited, but at across-the-room ranges, it gave good practice for presentation and fast sight acquisition. It also does not tell you if you are high, low, left or right of center, just "you got a hit" or nothing.
The system's big advantage (or drawback) was that you could use the cartridges in your real gun(s), so you could practice with your carry piece. At home. Without backstop or ear/eye protection (Don't let the laser bounce off a reflective surface into your eyes, though.) just as you would find yourself in public.
I have a target for the system I bought at a used goods store. But I don't have any of the cartridges. If anyone has cartridges (in order of preference) 38/357, 45 ACP 44, 45 Colt or 9mm, please let me know. I have no idea if the target works or not, so if I could buy them on approval (or cheaply), contact me, please.
So, yes. Air is good. Don't scrimp on quality.
REMEMBER! The safety requirements for air/CO2 guns are almost as strict as for gunpowder guns. Noise is the only thing that drops in consideration. Ricochet danger is higher, so good eye protection is vital. Backstops can be lighter, but still must be there. Gunhandling and range security must be identical.
Lost Sheep