Nothing I can say that hasn't already been said, but maybe I can add a little of my own perspective. I'd been trying to teach myself how to shoot for years, and got to be a pretty decent shot on my own. I've been reading here for a little over a year, been a member for almost a year, frequented other gun boards, read magazines, articles, etc. My shooting got better over time, but about 6 months ago I hit a brick wall in terms of improvement. My shooting had gotten as good as it was going to get without additional help, and had actually started to deteriorate, regardless of frequent practice.
I had long fought the idea of purchasing a .22 - but once I saw that my shooting habits were getting worse, even with practice, I decided to make the leap. I bought a Ruger Mk II and improved pretty quickly. So, you already have one of the most essential tools you can have for improving your pistol marksmanship... a .22 (and a fine one at that
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Secondly - and I'll put my flame suit on for this one - reading here isn't going to help much... at least it didn't for me. THR is a great place to learn about a lot of things, but in order to seriously improve your shooting, there's no substitute for a good book, written by expert shooters - and/or classes. I chose to go the book route, and found that with one read of The Army Markmanship Training Guide, my marksmanship got a LOT better. Of course, reading helps nothing if you don't desire to improve. Recently I was introduced to a book called
The Pistol Shooter's Treasury.
This book has changed the way I do almost everything regarding shooting.
It's a compilation of atricles written by champion shooters. It's VERY repetitive, and easy to understand - so the fundamentals of shooting are literally implanted in your head. It also has a re-print of The Army Markmanship Training Guide as well as numerous other articles by some of the best pistol shooters in history. It's an old book, and some of the information on ammo, target guns, etc. is SERIOUSLY dated... but the info on shooting is timeless.
Before, I could keep most of my shots within the 9-ring of a silhouette target at about 10-15 yards... Having read that book twice in the last few weeks, I'm now able to keep my rounds inside a target the size of a quarter at that same distance. Practice makes perfect, and dry-firing for 15-20 minutes a day will help dramatically as well. Learn the fundamentals, and test yourself.. There are probably a million things you're doing wrong, and don't even realize it. The book I recommended will identify these problems, but it's up to you to work at correcting them.
Just remember, pistol shooting is ALL fundamentals... THERE ARE NO SECRETS
It's all a matter of proper grip, proper sight alignment, and trigger control. Easy to read, hard to put into practice. Work at it, take a class, buy a good book or two, and you'll be well on your way to being better at shooting than you imagined. Good luck!