What does a 10mm do that 40s&w can't do when it comes to defensive against humans?
It sure makes people “ooh and ahh”.
Let me say this first before I poke at it: I am a 10mm fan.
It’s not so much because I marvel at the ballistics, but more a case of this:
If I can have a cartridge that shoots a specific bullet 950 FPS, or one that shoots the same bullet anywhere from 950 to 1200 FPS, I’ll take the one with more flexibility.
That’s a gross simplification, but the general idea is there.
The 10mm is not my favorite, but I like it. I’ve owned at least one for maybe 30 years, although I might go two years without picking one up. On the other hand, the last new gun I bought (Sep) was a 10mm, so my interest for it is definitely still there.
With all that out of the way…
I think the 10mm is, at least, misunderstood. I might even say overrated. Sure, it’s got more zip (technical term) than the .40. More than the 9mm. More than a lot of cartridges.
But it is NOT some fire-breathing stopper of dinosaurs.
When I got that new 10mm recently, almost everyone who saw it reacted the same way. Comments like “What? Are you expecting some Grizzly to show up here?”
These are people who know more about guns than a huge percentage of people, and not just some hoo-yah (another technical term).
It’s no slouch, but it’s not that wild and wooly either.
Many times I’ve seen the 10mm compared to the .41 Magnum. Even as a fan, that makes me grit my teeth. Other than being somewhat close in bullet diameter, I don’t see the comparison. The stoutest 10mm loads and the mildest .41 Mag loads overlap, and that’s it. I can probably find several pairs of cartridges to do that with. This does not make it a valid comparison at all.
I haven’t taken a shot at answering the question of what the 10 does the 40 doesn’t.
It’s fun to reload if you like experimenting. As I said, it can be loaded below the .40 to well above the .40. However, I don’t think that is the biggest appeal.
It has been chambered in some interesting guns over the years. That helps, but again I don’t think explains it all.
You can hunt some animals with it. Yeah, but I can say that about a lot of calibers.
Mostly I think what it has is the appeal of being different.
If you get bored with the standards, here you go. You can play with an oddball without it being TOO odd. It IS a good cartridge and reloads easily. You can play around with loading it without requiring custom dies and watching auction sites hoping to find a handful of brass. It is still a curiosity, since when people see someone with a 10mm, most will take a look.
This is where it does compare to the .41 Magnum in my opinion. Both satisfy the urge for something different without getting carried away about it.