Don’t know about “dieseling pellets” but yeah correct yeah a calculation between pellet weight an speed equals power how ever you measure it in joules or foot pounds. Common pellets on the market do change the “power” but only by around 1/2 flb typically that’s why most manufacturers set rifles to around 11 ish with springers an they do creap up over time once bedded in. Pcps tend to be set a bit higher as the generally a lot mor consistent