Once during a controlled practice session while trying to learn to draw and shoot with the opposite hand as if your gun hand has been wounded. this means drawing across your body and since I have a 1911, I had to flip the thumb safety to fire. I'm right handed so I had to shoot left handed. When I tried to flip the safety I had to cross my thumb over to the same side as my trigger finger. In doing so, as I flipped the safety (very awkward!) and my middle finger slipped inside the trigger guard and fired. I'd think the grip safety would be even less likely to be depressed in that situation. Since then, I have installed a ambi-safety - problem solved. I know it's not the same scenario, but it seems relevant to me since I tried your method with an empty gun.rm9792 wrote:How could you possibly pul the trigger while thumbing the hammer? Grip safety. If your thumb is up on the hammer then you cant be pushing in on the grip safety. You are correct it is a very akward movement if already drawn and pointed. Try it with it in the holster and the trigger is still covered. Your hand is in an unnatural position of being over the pistol. As you are drawing you are also placing the thumb on the hammer and pulling down while pistol is coming up into play. Once the pistol is in front and coming on target your hand is getting into position with finger alongside the trigger guard in a ready position. This does require practice (lots) to perform smoothly, strong hands and a large grip.
I also think that there are enough tactics that need 'lots of practice' that there doesn't need any awkward techniques added.
I wouldn't mind continuing the discussion, but you are determined in your method. Good luck with it, and maybe I'll try it a few more times before dismissing it.