"Your field accuracy is a lot less than you think"
Mine isn't. My field accuracy is exactly what I think it is. In the field, I shoot nearly perfect one-shot groups. Almost all the time. When I don't, it isn't because of powerplant inferiority, but usually because I haven't accurately judged wind speed and direction and/or haven't properly compensated my sight picture for it. In other words, I'd probably miss the mark with any air rifle shooting diabolo pellets with low ballistic coeffecients below the speed of sound.
.."your springer poi changes alot from one shooting position to another."
The thing is that I only have one shooting position for the overwhelming majority of hunting that I do. That position is standing, also known in some circles as "offhand" or "unrested." Trees aren't terribly abundant in the High Desert of Southern California, and if you mess around looking for a rest before shooting a chukar or quail on the ground, it isn't going to stay on the ground long enough to accomidate you. It's got wings and it knows how to use them.
You also aren't going to do too well if you sit on your butt first before pulling the trigger. Even if a chukar or other game animal would sit still long enough for your to make all of the motions required to go from fully-erect to sitting or kneeling, you probably won't see the critter too well through all of the chaparral and cheat grass that will be blocking your vision, not to mention your pellet's flight.
..."if you compare a springer and a gas gun (CO2, pumper, or pcp)of similar price and power, the gas gun will outshoot the springer in the field"
Nope. What do Benjamin 397's go for these days? $115.00? I've got a 397 in bone-stock condition except for the removal of the factory back sight and installation of a Williams peep. Compared to my wife's Shadow, there is no comparison in fifty yard accuracy from any shooting position. The trigger of the Benji makes the standard Gamo trigger feel positively match-grade. The light weight of the Benji makes it more difficult to shoot accurately from standing than the heavier, scoped Shadow. I've run that test, and the Benji is sorely lacking. Maybe if I removed the glob of paint from the end of the barrel and did something with the trigger........
Late in the upland game bird season, I'll be hunting in the gray light of the pre-dawn in temps down to 19 degrees F. I don't think a CO2 rifle will even discharge in temps that cold, let alone group accurately.
And speaking of "real world" accuracy......
I have to confess that I am not to terribly concerned about five-shot group size as being the end-all and be-all of accuracy in the field.
Why?
Because I tend to shoot one-shot "groups" on game. What I am concerned about is whether I can put ONE shot from a cold gun where I want it go. I can do that with my springers. And I'm not shooting anything terribly exotic -just a pair of R-9's, an R-1, and soon, another Gamo Shadow. And I can do it all the way out to 50 yards, and slightly beyond. And I can do it standing up on my two legs without the aid of a rest.
And yes, I am a very good shot. Not because I am particularly gifted. I wasn't blessed with superior eyesight. I've worn corrective lenses since age two. I wasn't blessed with above-average hand-eye coordination, either, as my high school batting average of .242 amply attests to.
But I can shoot my spring-piston air rifles as well as I do because:
1) I had the benefit of qualified, expert instruction. In the case of the air rifle, I shot on a collegiate air rifle silhouette team back in the 80's, before the airgun universe knew what a modern pcp was. I learned proper springer technique and had it drilled into me.
2)I have the discipline required to practice, and my practice time is sacrasanct. I train seriously for the conditions that I face in the field, and that means that aside from sighting in, I don't do much shooting from anything other than a standing, offhand position.
3) I know how much things like temperature affect my POI and cause it to shift, and I compensate accordingly. I know because I shoot targets in the same weather conditions and at the same altitude range that I hunt in. I practice so much that doing all of the compensating one needs to do to hit game in the field where distance is guessed at, as is wind speed and target inclination, becomes second nature.
In 25 years of hunting with spring-piston air rifles, I haven't found any need whatsoever to go to the "dark side" of pcp.
But I can sure think of plenty of very good reasons not to.
-JP