Cheap reloading.....
The best advice I have seen about reloading is that reloading does not save you money. You just get to shoot more with your money. Or words to that effect.
A single stage press like the RCBS rock chucker is a good start. My two cents is that you can get in trouble reloading so start simple and learn the basics. Reloading rifle ammo is doable on a single stage press. The matches I shot only needed 56 rounds. Shooting a pistol is a different story. I can go through 300 rounds in an hour if I take my time. If I run fast drills I can go through 300 rounds very quickly.
A progressive press will help produce the rounds. They are expensive though. If I was to buy a progressive it would be a Dillon. Never hear anyone complain about the products or service only the price.
I like the 10mm. Its a very versitle round. Obviously the 10mm has a large case than the .40 but it can also handle higher pressures than the .40. 10mm rounds at the higher loads are a real handful. I have shot commercial and my own loads at higher levels. It kicks.
I don't mind carrying a larger pistol. I'm big enough that it does not print easy and the weight just does not bother me at all. But it depends on the person.
Glock and only a few smaller manufactuers make a 10mm auto loader now a days. Pretty sure I saw one on a 1911 style pistol. S&W had the 1006 and 1076 series but those are not made anymore. You might find one for sale. I fired thousands of rounds in the the third generation S&W 9mm and 45 pistols. Seen lots of people do the same. They work good and I have never seen a pistol caused problem. People caused yes.
S&W might make a 1006 or 1076 if there is a large enough order.
The following may or may not matter to you...
If you go with a Glock make sure the empty mags fallout when you press the magazine release. A 9mm Glock I played with decades ago had this problem. I would not buy a defense pistol that does not drop magazines when it should. This is not supposed to be a problem anymore but I would check.
The Glocks I have read about require the trigger to be pressed to field strip the pistol. I think this is bad design. The trigger should make the thing go bang. That is all. I have some rifles that require the trigger to be pressed to remove the bolt. Don't like it. Don't like it at all. The rifles were given to me. I would not buy them.
I do like the Glocks trigger pull much better than S&W Double Action's. Also some pistols have a magazine safety. Some pistols will fire with the magazine out of the pistol. Some won't. Personal preference if you buy the pistol vs it being issued. Just be aware what YOUR pistol does.
I wish the 10mm was more popular. American Handloader had an article on reload the 10mm sometime this year. Missed the article but I read they had done the story.
Later,
Dan