wep45,
Muzzle Energy/Bullet Energy are somewhat meaningless figures, unless it can be transfered into a target.
Whether some, most or all of it can be converted from kinetic energy into knockdown power, is largely upto bullet construction and how it performs.
All I'm trying to say is don't rely totally on the highest ME figures to automatically give the best result.
For example, A bullet with a lower ME figure maybe designed/constructed to transfer more % of it's energy, in a given situation.
(Think of non-expanding FMJ's when compared to HP's or SP hunting bullets.)