What barrel length and did you chrono the 26 gr load?I've shot quite a few of those loads in my NM Blackhawk.
I've went from 22 grains up to 26 and let me tell you, you know you've got ahold of something when you get it up to 26.
Be sure and put a good roll crimp on them and use a magnum primer.
I will put this here just in case someone new to reloading reads this:
THIS LOAD DATA IS WAY ABOVE SAMMI SPECS FOR .45 COLT AND SHOULD ONLY BE USED IN LARGE FRAMED RUGERS, FREEDOM ARMS OR T/C FIREARMS.