Even adding an aftermarket High Output Vortec spring kit to something like a Weihrauch 95/Beeman R9 can affect the handling and accuracy and not always in a good way. A lot of people end up cutting a coil or two off the spring to tame it down and get their accuracy back. PCPs do not have that problem, and are capable of giving good accuracy to a point. Remember that there are limitations to pellet design, and at a certain point (around the sound barrier) the pellet becomes unstable. That is why some shoot slugs in their PCP instead of diabolo pellets. Or they shoot very heavy pellets to get the speed below the sound barrier and give more delivered energy on target. So many options, so little money