Big caliber guns is an American...everything bigger and faster...thing. Many smaller caliber and gage weapons are plenty big enough. Nothing wrong with ye-old 20 gage. Had a friend in the way back who used a 20 gage when we went hunting...worked fine.

Canning is pretty simple...time consuming but pretty simple and really satisfying. The first rule in canning has to do with acidity in food. You can tomatoes, you can do that with a Hot bath method without pressure...if you do low acidic foods like beans, squash, and meats you have to use a pressure cooking method. There's a third way that allows pretty easy no boiling of cans method but the food is only safe refrigerated and only for a few months. There's all manner of instruction on the net.

The pressure cookers needed for that kind of canning range from 125 bucks to hundreds more than that depending on the size.

The boiling without pressure, like for tomatoes, only requires a relatively inexpensive big metal pot that some number of jars will fit in.

There is no such thing as too much horsepower, sex, or ammo. 😁

My thing about prepping...beans and bullets.