I'd rather have a big knife or bat than a 25 honestly. We have a good family friend that is the chief of police in a city nearby and he's told me so many stories over the years. One that always sticks out is when he was called to a scene of a shooting. There was a group of guys playing poker and drinking, two guys ended up arguing for whatever reason and the one shot the other guy point blank in the forehead from across a poker table and when our cop friend arrived the guy who was shot was kicking the other guts butt and when they separated them the guy still had the bullet stuck in his forehead! It BARELY penetrated from ~4 feet away. I'd get a 22LR long before I even thought of a 25acp.
Emphasis added.
The problem here
may not have been the caliber. I have heard of at least two cases of
.357 Magnum and at least one example of .45 ACP doing
the same basic thing. In those cases, the rounds did not penetrate but instead bounced off. The forehead area of the human skull is not only very hard, it is also angle in such a manner that bullets often do just bounce off. Same can be said for putting down injured animals. Shooting them in the forehead is fine if you don't mind it not working, and you like the idea of lead shrapnel getting stuck in your shins
. I suppose that may be one reason why many instructors recommend that head shots be aimed at the "T Zone" - no higher than a line running horizontally through the eyes with a another running straight down the nose to the neck.
As for the OP...
Assuming funds are tight right now and you are not yet able to upgrade, take the Raven out to a range to verify that it even works. Sometimes they don't. If you are new to shooting, don't be afraid to ask the staff for help. Assuming it functions reliably, I'd have no qualms about relying on it until I could save up for something better. Your mindset will be your most important tool anyway, God forbid the crap ever hits the fan. It is the indian, not the arrow as they say.
Granted, I have more potent options for home protection. If I were in your position, I would set a goal to replace the Raven at some point. For home protection, a used pump shotgun in 12 or 20 gauge are excellent values (often under $300, sometimes under $200), as just one example.