It a depends on what you mean by "Charged" C02 is the least powerful. Usually less than Spring power. Pump is the next most powerful but is still less than most spring powered rifles. PCP (PreCharged Pneumatic) is the most powerful, it's way beyond spring power. PCP's are usually charged to 3000 PSI and capable to fire a 50 caliber pellet.
Gas charged piston rifles are about the same as spring powered rifles
Not recommended. Not desgined for a more powerful spring.
Yes. Pump, Spring and PCP (PreCharged Pneumatic) are all more powerful than a C02 system
Yes it can but getting the current rifle "Tuned" by an expert will get you better results. Tuning will make the spring and trigger perform better.
First, it is rifle, not riffle. Second, no, or we would shoot tanks with a rifle. Cannon are more powerful. Finally, depends on the rifle. I have a .22 rifle and a .44 magnum pistol. The pistol is far more powerful than the rifle. I also have a .22 pistol, and a 30-06 rifle. The rifle is far more powerful than the pistol (in THAT example).
30-06 is much more powerful.
270
Yes
i had both a spring pump and electric and the spring pump was stronger. although the electric was more convenient
No
NO!
If you mean .17 HMR and .22 LR, yes.
Depends on the load