Quote Originally Posted by Sagres View Post
What was the spread of fps between those 10 shots?
At the muzzle, less than 10 f.p.s. At the target, often double that outdoors. I used regulated and non-regulated rifles, springers and gas-rams. Incidently, the two occasions I clamped the precharged rifles' actions to a rig, the groups actually got worse.

As so often happens, there are more questions than answers, mate.