We can own rifles with the standard Mauser lock and with a magazine up to 5 bullets.
Pumps, yes, and semi-auto shotguns capable of 4 cartridges, yes.
Rifles varying from .22 all the way to 30-06.
You can reload your own casings, yes.
You can have a gun in the house, and you can shoot on your own land outside populated boundaries.
Usefulness of handguns, I fail to see.
You can NOT shoot an intruder, - that will just bring you to jail, unless the cirkumstances are extremely in your favour.
NB, most intruders are drunk and missing the right door, or looking for a party.
Burglars are rare, and almost never armed, and thereoff never with handguns.
People where I live, in the countryside usually never lock their houses, nor do they take the keys out of their cars!
(I take mine out on friday nights when there is a dance nearby)
I cannot see how more guns would improve such a status, and the US crime rate would certainly not support such a theory!