What never? Well, hardly ever! I too was taught to never dry fire any gun. Then I grew up and bought my own guns. I took the time to read the manual from Ruger, it states clearly that its OK to dry fire, so I do....No I don't dry fire hardly at all either. I was brought up to 'not' dry fire any guns.
Same upbringing. Always amazes me to see a 'shopper' at a gun shop cock & dry fire a gun.... but I personally don't see any need to do any dry firing, so I don't ... except a few times just after a trigger job and then I usually put my thumb in-between. Just me .
I've had the same positive effect. Since I started dry firing, my ability to group has increased significantly. And the trigger is much smoother. Makes me doubt the trigger jobs I had done on my GP and SP revolvers. They were low round guns and I've found all my low round Rugers have crappy triggers. My new SBH Bisley's trigger is great after a few thousand dry fires, I doubt I'll change the springs or have a trigger job done on it....Norm Ricci gave me some good training tips. Among them was to practice dry firing at a small target. It was amazing how my scores crept up, it works. Norm was a master rifleman at the camp Perry matches.
Based on the reports here, it's the act of using the gun that causes the failure, not dry firing specifically. If your t-bar is pinched, it's going to break eventually, no matter if the gun is dry fired or not. Dry firing just brings the breakage event sooner. For the record, I do plan on thinning my new t-bar to eliminate pinch. And if your gun is used for hunting or protection, you should be very sure the t-bar isn't pinched.......If you are now dry firing with the same gun without 'curing' the pinch, you are simply going to break another bar sooner or later...
Glad it has worked for you .... But for me, I'll continue to go to the range a few times a week to exercise my trigger finger there, and continue to cycle my un-tuned SA revolvers (about one every couple months) to the gunsmith for a good action job. Some day, they all may be 'up to par'.... Because, for me, that has made a world of difference once I know what a good trigger should feel like. Before I shot them 'well', now I shoot 'em even better. Not a goin' a back! Next one that is getting the treatment is an SS Old Army .Since I started dry firing, my ability to group has increased significantly.