Would a Mosin be too much for home defense?

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Overpenetration of rifles*, unless one is using FMJ or AP, is just a modern gun myth. Fire a softpoint out of a rifle and a pure lead bullet out of a handgun, and the handgun bullet is going to stay nice, compact and stable while the rifle bullet will deform violently, and as a result, the much slower hangun will penetrate more ballistic gel, or drywall, or water jugs, or whatever people make disposable houses of.

*Excepting old style rifles which fire heavy but slow bullets. Old BP loads with .45-70, .45-90, .50-90, which move very heavy bullets at very modest velocities... well, they're going to go through soft things very very well.
 
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Overpenetration concerns would appear to diminish too since the projectile's velocity loss from the shorter tube would be significant

NO. No, NO, NO! With expanding ammunition, penetration usually decreases as velocity goes up.

You could pull the bullet and replace it with a .310 Hornady 123 grain SST or some such. Might help minimize the overpenetration a good bit...

As I pointed out, the expanding ammo available cheaply does not overpenetrate.

If its defense against grizzlies in the wild or what not, id be more happy to have a mosin nagant with 204 gr SP . Honestly i would feel more secure in such a situation...

Well, it's great to feel secure, but as I pointed out earlier, the most similar 203 grain Russian ammo tested in gel only penetrated just over 14". And that's in 10% gel, not large dangerous game.

John
 
Reading. Is. Key.

SP 7.62x54mm is not overly penetrative. I already linked the gel results. It penetrates less in tissue than many common defensive handgun rounds.
 
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