Regarding training for an "unavoidable emergency," for that's what this subforum is about, wouldn't it be imprudent to regularly train with handgun mechanism #1 yet EDC mechanism #2? The best - worst- example is myself.
1. My EDC is an SP101 three-inch barrel. I've had the hammer altered to force double action only. For longer range shooting, were the target far enough away to allow more deliberate shooting, sharp edge of off-hand side of hammer has been beveled to allow me to revert to a single action mode - only by starting hammer via trigger, following it up by completing cocking hammer with off-hand of two-handed grip. Holster is high, canted cross-draw.
2. My four-inch SP101 is altered to be the same. Holster is high cross-draw Bianchi CD-127. While a nice combination, discomfort in the woods high.
3. Hiking, woods walking, and anytime I'm in one of the state or national forests that surround my home, I carry a Freedom Arms Model 97. Holster is cross-draw with safety strap secured to holster body with stud.
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I have a problem. In the woods I am comfortable with the small powerfully loaded 45 Colt single action that is slow to get shot #1 fired. EDC I am comfortable with SP101 while being extremely uncomfortable carrying it in the woods. The four-inch SP101 is my attempt to overcome the anxiety of a small cartridge while maintaining EDC's mode of operation.
Having typed that, I strongly prefer my Model 97s compared to double action revolvers because they are much easier to cock and shoot, despite extreme difference in what happens when hammers are dropped, especially when MCTD triggers arthritis.
So in that "unavoidable emrgency," what will my anxiety cause me to do - double action draw-and-fire or fire via single action mode? And which revolver am I carrying? Since I've never had such an experience, I continue to carry and use mutually incompatible [revolver] mechanisms. I am certain I gotta get out of this situation because . . . . this incompatibility could get me - and any other person who carries with such a basic incompatibility - injured or worse.