The rifle develops the power, not the pellet - ignore the advertising hype.
Your rifle has a limit to the power it can provide to push the pellet up the barrel.
Fact : Your rifle will be able to push a lighter pellet up the barrel faster than a heavier pellet.
Use this as an example - Try throwing a tennis ball - it goes a long way - yes ? Now try throwing a house brick - not so far eh ?. It's the same with air rifles (unless they are modifed).
Light pellet = more fps than a heavier pellet but the ft lbs remains the same (or there abouts). It's a mathematical fact. I've been there - done that - trust me, I've tested them all.
Just buy sensible standard top of the range pellets RWS, Premier, Air Arms - ignore the so called 'super magnum' pellets.
Good quality, accurate pellets are what you need.
Good shooting - webmaster.
What is your main interest. f4bscale magic website
amen to webmaster , but RWS are ok, i've had them for ages, but logun penetrators really are incredible (not for the squeamish though if you are shooting game)