I am a believer in the sense that a specific barrel likes a specific pellet at a specific speed.
If I can take my FX Ranchero as an example. Its got 3 power settings, low, medium and high. The rifle gives its best groupings at 35 meters when I shoot it at its highest power setting. The groupings opens up when I dial down the power, no matter what pellet I use.
Now, many people talk about installing gas-rams to their springer rifles. Lets say you take a fixed barrel that is currently shooting at 850 fps. You want to now gasram it to shoot at 700fps. Will accuracy not suffer, despite the fact that the gasram is smoother etc?
I once thought of buying a known to be accurate fixed barrel springer, like a HW97 or so, and fit it with a low power (600fps) gasram. But looking at the results of my FX Ranchero I had second thoughts. My .20 Axsor is currently with Kevin to sort out an air leak, so he can confirm if he wants that it is truly a one-hole shooter at 35 meters. And it shoots at a high 900 fps average.
So my question: Are lower velocities not hurting a rifles accuracy when it was designed to shoot at a specific speed with a specific pellet in that specific barrel?