Here's a good way to train.
THIS REALLY WORKS
Take a sheet of white paper. Run it out as far as you can where you can still clearly see bullet holes on the paper. Unless you have really sharp eyes, it's going to be way less than 25 yards, probably more like 15.
that distance is your "visible bullet hole range"
using a circle template, draw on the paper a circle in pencil that looks the same size at "visible bullet hole range" as a 6" target black looks at 25 yards.
color the circle in light enough that you can see it but also still see the bullet holes.
The idea is to recreate the visual picture of shooting a 25 yard 6" pistol target but with the target close in enough that you can immediately see the bullet holes as you shoot.
If that's too much work, just draw a little 1/2" mark to shoot at
now take the pistol in a true weaver stance. no cornball pancake hold or any of that bullshit. wrap your weak hand around your strong hand.
like so:
use a 6 oclock hold on the target
focus your eye on the front sight.
do not try to hold the front sight right on target. let it wander. concentrate on sight alighnemnt and trigger control, not the target. you can let the front sight wobble all over the place and still shoot well.
as the bullet holes appear on your target, the instant feedback will immediately improve your aim
this drill works great. the human brain works best on instant feedback. it's called "conditioning".
the best shooting I ever did was a 7/8" 5 shot 25 yard with a 22 revolver. I immediately backed it up with a 1.25" group. Not ready for the olympics, but I can pass the paper plate test with any handgun.