TexasCHLforum.com

Rimfire practice is good for some things and bad for other things.

Rimfire is good for things that don't involve recovering from recoil .

one shot draws (or press outs)
one shot each transitions between targets
slow bullseye accuracy practice

Rimfire is bad for for things that involve recovering from recoil, pretty much any multiple shot strings.

In your specific problem, it sounds like you've shot so much rimfire that you've developed a flinch with 9mm.
Your brain knows that you're shooting 9, your ears hear 9mm noise and your instincts want to control that greater recoil.

The first step is to double up with earpro. Use disposable plugs and good muffs, especially if you are shooting indoors.
The next step is to dry fire. Dry fire at the range 5 times, load one live round, shoot it and repeat. Don't worry if you aren't getting a tight group during this. You are training to get rid of a flinch. Concentrate on getting a surprise trigger break. Don't crush through to make the shot go off RIGHT NOW. Let the pressure on the trigger increase until the gun goes off, SURPRISE!

In addition to dryfire, do the ball and dummy drill.
http://pistol-training.com/drills/ball-dummy-drill" onclick="window.open(this.href);return false;
You don't need to have a partner load your mags, you can take 4 live rounds and 2 dummy rounds, shake them up in your hands and load the mag without looking at it.
You can mix your WWB and your Gold Dots and do the same thing.

Once you work out the flinch issue, then you can go back to stressing over your group size. If the flinch comes back, do some of these drills again.

I've been shooting competitively for 15 years, I still shoot the ball and dummy at every practice.

Gringop