I got real lucky with my 40X. It shoots Eley Blue EPS quite well.

I can put 60 shots (an International Prone Match) inside 1 centimeter at 50 yards.

I got even luckier when I bought two cases of it a few years back for $230 a case.

Mine shoots Eley Back and Red just as well. Another good flavor for my 40X and Sportsmans Team Challenge 10/22 is Eley Biathlon (not made anymore) and Lapua Polar Match.