There was a post a few weeks ago about a kaboom with a glock 20 due to the chamber not being fully supported and use of buffalo bore. Definitly not for hot loads. Something to think about
I've personally loaded and fired tons of max loads to no ill effect, not even bulged brass, and all using factory barrels, that is something to keep in mind. Another thing to keep in mind is that the QC of some of those ammo makers is questionable at best. The ONLY time I've experienced Glock smiles is with, you guessed it, cheap (RBCD in this case) factory ammo and not my handloads or quality ammo with low deviation, like Hornady. When firing +P or similar ammo, use it from a reputable maker in the industry, not a boutique dealer, and don't fire a bunch of it over time, it can cause a KB. If you see Glock smiles, you are firing ammo that is over pressure, standard pressure ammo, even the hottest book loads, just don't do that.
I love my G20 and G29, looking for a Smith. Not sold on the 1911 being the best platform for 10mm, it simply wasn't made for that kind of punishment. So what fits you depends on what you are lookiing for in it. For carry, hard to beat the G29. For general firepower that works, hard to beat the G20. The Smith is a tank, and the 1911, more elegant but I personally don't think it is suited to full 10mm loads.
So take your pick! In my opinion it is had to go wrong with either the G20 or G29 depending on your needs, for backpack and range pistol, go with the G20, for carry and range, go with the G29. They are both great. The SF frame is also nice, it makes it more comfortable in the hands, but make sure to get the regular mag release and not the ambi one. Been there, done that, got a new frame. The G20SF with regular mag release, it is pretty nice... But I like to carry my G29, easier to shoot and more accurate than the G27 with slightly stiffer loads. It too can be loaded like a cannon, but I have the G20 for that, it's more of a range toy for me.
Finally, 10mm is a handloaders cartridge. If you don't load or plan on it real soon, it will be expensive to shoot and the ammo will be watered down. Factory 10mm ammo has to work in all the production pistols, including the 1911, which is, in my personal opinion, why it is watered down. The heavy stuff just batters 'em too much, but my G20 and G29 can take fairly heavy rounds all day with stiffer springs. No problems at all, but obviously these more powerful and accurate loads were made by me.
If you don't handload, the Glock G24 or G35 is a better choice. .40 factory ammo, on the other hand, is relatively hot. All of it. .40 is the ammo buyers cartridge (because it is difficult to safely reload, but that is another story).
Well, these are my experiences and observations. Good luck!
