I know most experienced air gunners will know the answer to this, but hopefully this will highlight to those not so experienced who are considering cheap pellets if they are on a budget.
This was an adhoc video when for a giggle I put some cheapo pellets into a rifle I was reviewing and was quite shocked at the result.
https://www.youtube.com/watch?v=ATQFjRBdM3U
Hope this helps some people.