Thanks for explaining. I think I understand.

So would I be right in thinking, in an ideal world , pellets of different weights,within reason, should be making similiar sort of power.

eg, a recent 22 hw95 that's had a piston extension and piston weight removed output is 16grn 10.9,14.3 10.85, 13.4grn 10.75 and 12grn 11-is that ok?