A more self-reliant meat source would be meat rabbits...they take up less space and have a quicker, higher meat to feed yield than do chickens. You can even raise them on pasture in tractors and have less fear of predation in that manner, and you will have dogs on guard anyway.
Done properly, you could have a working, rolling flock of Plymouth White Rocks of about 40 birds, add 2-3 Cochins for brooding your eggs(you will also have WRs go broody as well, particularly if you are using heirloom bloodlines), which will yield huge cockerels for slaughter, great laying genetics and huge old hens when they are done laying. I'd put one of my spent WR laying hen's carcasses up against most 3 yr old roosters of any other breed out there.
As for stewing them or cooking a chicken in the oven...if you truly want to be self-reliant, this will not be the way to go. You lose so much of the bird in that manner and you also have to store them in a freezer, which requires electricity...one power out can render your entire winter meat stores lost. Canning your chickens is the way to go....you can use everything but the bawk for stock, rendered fat and meat without any fear of losing any of it. They will stay preserved that way for some years safely and you don't have to worry about freezer burn, cleaning out the freezer of meat no longer usable, etc.
Rabbits are great canned as well.
For self-reliance, I'd mix a flock of the WRs and have some NZ white meat rabbits as my meat source and keep them both producing at maximum efficiency by judicious culling, frequent breeding(rabbits), and using the Cochins for their brooding abilities.
With a good farm dog there's no reason you can't free range safely. Back him up with a shotgun for any stray dogs and you are golden.