Thanks for the dime trick, guys. I did it for a week, then took my 20 and 26 to the range on Saturday, and shot standing at 20 feet. Results:
First shot with the 20 took out the center of the X. Next 5 shots went through the rest of the X. Next 44 shots removed the complete X-ring, and edged into the 10.
The 26 was a bit more ragged, possibly due to fatigue, possibly due to the ghost-ring rear sight, possibly due to a 25-mph crosswind. 50 shots, X-ring gone, a few more in the 10-ring than I got with the 20. I'm still happy with it.
I then did Mozambique with the 26, 50 shots, tac-reloads (2+1, change mag, repeat until both mags are dry). Holy wowsers. Didn't know I could shoot that good.
I'm gonna use the dime trick at my next pistol class (next month). Wish I'd known about it sooner.
"The evils of tyranny are rarely seen but by him who resists it."
-- John Hay, 1872