It may work equally well for the "critters" that you are shooting with it, but they are still not equal. It may be comparable to some weaker 10mm loads, but not even close to a full power 10mm.Just a matter using the right bullet and load.
I have shot enough critters with 255gr cast bullets to know that a 10mm will not out perform them. A 255gr flat point cast bullet at 900fps from a .45acp will kill anything with at least equal efficiency of a 10mm.
I did misspeak...the trajectory of the .45acp is not the equal of the 10mm, but I was not really speaking to long range accuracy with my comment...but the killing power is...and you can believe that or not...entirely up to you.
If you think that the 10mm is superior...go forth in that belief.