re the G23 vs G45. mechanically a Glock is a Glock. The G45 has a longer grip and the pinky is actually the strongest part of the grip so most people shoot full sized grip guns better.
However, for a single shot with no time pressure there should not be much difference between a G23 and a G45. Multiple shots with time pressure is where the G45 should have a noticeable advantage.
Time pressure (as opposed to pure reaction) can enhance pre-ignition push issues.
Watch the Chuck Pressburg video. Then watch it again after your next live fire session, ideally after you videoed yourself or had someone video you in slow motion.
Chuck has forgotten more about pistol shooting than I know.
From where I'm sitting in front of my keyboard here in Arizona, I think you might actually be in a really good spot to access trainers who should certainly be able to help you. Do these names look familiar?
https://www.justifieddefensiveconcepts.com/
https://www.green-ops.com/
@kain
I'm willing to do some one on one coaching with you. I sent you my cell number. Give me a call if you're interested and we'll work out the details.
3/15/2016
I think part of your problem is stress. When you're at a range with someone and you've made it clear you can't perform and their are no expectations you surprise yourself. When you're around LE instructors and you really need to get it done, you flounder.
If you really want to do this, you need to stop bitching about the drive and the money and get to the range. If you go shoot 200 rounds a week for 3 months you'll see a difference. If it matters to you, then put in the work. That means live fire more often, and become accustom to shooting. Just plain getting comfortable.
That having been said, during that time it would be very beneficial to pay close attention to the technical aspects of shooting so you can improve on your fundamentals. When you're shooting by yourself there is no pressure. It's a fun day at the range. Grip a lot harder with your support hand. Relax your grip somewhat with your primary hand. Don't worry about where your finger is on the trigger, as long as it feels natural. Point your sights at a sticky note 3 yards away and shoot. Nothing is on the line if you don't hit.
During the period of regular practice, seek out coaching. Note, I didn't say some guy with an instructor cert. Someone who knows how to shoot AND knows how to teach is important. Any competent shooter can say "focus on the front sight" "slow down get your hits" and "More/less finger on the trigger and get an instructor cert from an LE agency or the NRA. None of that means they can see what you as an individual needs and is doing wrong. A good instructor is a lot more like a coach, who adapts to you a a shooter. A few hundred rounds with a good instructor will drastically develop you as a shooter - If you have a good attitude and walk in open minded. Having your mind made up you can't do it when you head to the range - will guarantee you're right every time. A good instructor will be able to look at you as an individual - hand issues included - and help you get where you need to be. Right now, you don't really know what you're doing wrong, and that's okay. That's what solid instruction is for.
You CAN do this. Seek a competent instructor (preferably one suggested by members of this forum. I'm betting you've been PM'd with suggestions for who to see in your area). Then, spend the time regularly shooting on a minimum weekly basis. Don't look for the time and money, MAKE IT HAPPEN. It'll sort itself out. If you couple regular range trips with good coaching you'll improve drastically. At the level you are at, I'm not certain dry fire will help you. You need to know what correct is like before you can practice it dry.
I probably come off as a bit of a dick, but please know I honestly want you to improve and do better.
Edit:
Call this man, and do what he says.
@kain
I strongly suggest that you go see the folks at Justified Defense Concepts. @TCinVA will be able to diagnose what you are doing and help you correct it. They are based in Culpeper.
@John Murphy of FPF Training is also in Culpeper and offers great training as well.
I had an ER nurse in a class. I noticed she kept taking all head shots. Her response when asked why, "'I've seen too many people who have been shot in the chest putting up a fight in the ER." Point taken.
I wonder if it might be something deeper than just "performance anxiety," and shooting may not be the problem. You couldn't shoot the 23 when it was your duty gun, but now you have no problem with it. You can shoot other Glocks that aren't your duty gun OK. But your duty gun is a problem.
Is there something going on at a deeper psychological level where you may not be ready to use the duty gun for "duty use" if you had to, and that's close enough to being in conscious awareness that it's keeping you from using it for sorta-duty use like qualifying? Have you talked with a trainer or counselor about what the consequences would be if you did have to use it, and are you OK with those? Is your brain pulling the handbrake to keep you off a path it knows you aren't OK with?
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Not another dime.