bill ace 350
Raw packing meat is the way to go with whole muscle, make a mess one time, and it turns out the same in my opinion.
I do brown large cuts in a little oil in a dutch oven before canning, browning the meat first adds flavor to the canned meat.
For ground meat, I brown it to about 1/2 way cooked, that way you can drain off the fat before you fill the jars. If you don't do that, your jars won't be as full of meat and will have way too much fat in them.
I don't add any extra seasonings to my canned meat, because I never know how it will be used.
Canning meat is a great way to get into canning, because its so straight forward and easy. Don't follow internet recipes, only follow approved recipes.
https://nifa.usda.gov/sites/default/files/resource/Canning Meat Poultry and Game.pdf
Buy the Ball Jar canning book they are all approved recipes. Follow the recipes and temps to the "T" and you'll have great healthy eats for many years to come.
Canning is a great way to food prep for nasty weather, power loss or a S.H.T.F. situation because it lasts for years in the cans, and it's already cooked you can eat it cold if need be.
I can tons of stuff, I'm canning bread and butter pickles and bread and butter asparagus this week. I love the asparagus in bloody Mary's. A few weeks ago, I canned up 24 qrts of pickled beets.
We don't have basements out here, which is the perfect place to store your canned goods, so I store them under the stairway, in the closet, it's an interior stairwell, so the temps remain cool dark and pretty stable yr round which is key to keeping your canned foods the best they can be.
You can also use qt jars to store bullets, pull a vacuum on them, and they will last many lifetimes.