I have an Uberti 44-40 lever action carbine, with a few Cowboy cartridges. I'm not really a rifle guy, most of my weapons are handguns or shotguns. Is the 44-40 cartridge an acceptable self defense round? Are there non-cowboy loads available that would make it better? Seems I'm limited to flatnose, as the new plastic tips, I don't think come in obsolete calibers.