I believe there's a difference between training and shooting, and the terms are often conflated. If your goal right now is to learn better shooting fundamentals, then you should buy the .22. Shooting .22lr has helped me come a long way in a shorter span of time and for much less money than it would have cost me to shoot as many centerfire rounds. Plus it's just a lot of fun.
Training is a different matter. If you're doing any kind of tactical/self defense training exercises, I believe you should use the exact weapon you will be carrying or using for home/personal defense.
Training is a different matter. If you're doing any kind of tactical/self defense training exercises, I believe you should use the exact weapon you will be carrying or using for home/personal defense.