I wear the electronic muffs even when hunting now, and I can tell you that they are a lot more uncomfortable over hearing aids than they are without them! Use hearing protection now! My hearing aids cost over $4,000.00.......... that would buy some nice guns, especially since they have a limited life span. I lost a good deal of my hearing in Vietnam, but I've also damaged my ears in past years by shooting without protection.
To answer your question, the .45 Colt does produce less muzzle blast since even the "Ruger" loads produce less pressure than the .357, or .44 Mag with top loads. Recoil also seems more moderate to me too, although part of that is due to the perception one gets from much less muzzle blast, and the concussion of muzzle pressure.