As far back as the 70s I can remember hearing about how too low a powder charge could cause a detonation.
It was always an uber rare event, and when it happened, it only happened with serious underloads of slow rifle powder in large magnum cases.
Not sure what has changed, but that was the days before the Internet....
From what I read nowdays, I get the impression that some people think if they deviate from published data in the tiniest amount their gun will blow up, they will be eaten by dragons and their children will die starving and alone to the 3rd generation because of their folly...
Generally speaking, when I want a lighter load, I use a smaller round. I have guns in .22LR, .22WMR, .221 Fireball, .222 Rem, .223 Rem, and .22-250. One of those covers everything I might want to do with a .22 cal rifle.
I have created and used reduced loads in a number of cartridges but I won't give my loads here because they are well outside published data.
But do consider this, I do have published data for .223 in the 1900-2000fps range with 45-50gr bullets. Its in my old Lyman book, and its for cast bullets.
These level loads will also work with jacketed bullets. BUT you won't find them listed in the jacketed bullet section. The reason isn't because they won't work, or because they are dangerous, the reason is simply SPACE (and money).
Reloading manuals do not, and cannot list every possible combination. The list where the focus of the majority of shooter expect. People shooting jacketed bullets are looking for high performance loads (high velocity). So that's what the manuals test and list. This doesn't mean light loads don't exist, it just means they aren't listed in the majority of data.
For example, you can load a .44 Magnum to 850fps, but you wont find that load listed in the .44Mag data in any common reloading manual, simply because so few people are interested in it.
There were bullets in the past like the Speer 1/2 jacket (or 3/4 jacket) pistol bullets that needed a minimum velocity to prevent the jacket stripping off, but those slugs are uncommon today (though they did work well and I still have some
) Shooting a modern jacketed rifle bullet designed to work at 3000fps and slow speeds of 2000fps or so is unlikely to cause problems, though it will likely affect the expansion of the bullet.
An alternate path to light loads is a chamber adapter. I don't know if you can still get them but in the past you could get a chamber adapter to fire .22LR in .222, .223, etc. You could even get ones to shoot .32acp in some .30 cal rifles. Slow and cumbersome,single shot only, but they did work. Accuracy varied according to reports, and you weren't going to win any matches using one,but it did let you pop that gopher in the backyard without using a 3000fps+ varmint round and telling everyone in a 2 mile radius you were doing it.....