I'm not going to tell you to go out and shoot it, but in general, these are fairly well-made guns and if they have been given reasonable care are still safe to use. You should have an experienced gunsmith inspect any old gun before you use it. Even if the 'smith gives it his blessing, I wouldn't use any magnum loads or steel shot. FYI, for the value, if it is a double from that patent date, and IF it is in good shape and OK'd by your gunsmith, it would retail for $200-$250 in most parts of the country. Small (28 Ga and .410) bores may bring more.
Depends on the shotgun- different types load differently.
Each ammo item is assinged a compatibility group.It is important not to mix different ammo groups.
Yes. It would be almost impossible to shoot skeet with anything else besides a shotgun because clays are small, fast-moving targets. The multiple projectiles from a shotgun make it possible to hit clays. You will want to use target-specific shells--anyone at an ammo store can help you find the right load.
Dirt, a bad load, an incorrect load, moisture, old ammo. Any number of things.
32 or 48 round cans
NEVER ATTEMPT TO LOAD THE WRONG AMMUNITION INTO A FIREARM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Do not do this
No
If your Iver Johnson is marked for the .22 WMR.then yes,if it is not then do not attempt to load or shoot .22magnum ammo in your rifle.
No. You should never try to load or fire any ammo into a gun other than what it is designed to fire. A .44 caliber gun is designed to fire .44 caliber ammo.
You put shells in the magazine.
No. 9mm Parabellum ammo is about .35 caliber, and the .45 is, well, .45 caliber. The .45 cartridge is too wide to fit in the chamber.
Nope. It is too small, will fall out of the barrel.