Take your time. Computers are strange like that. My email quit loading for 3 or 4 days with no explanation and then started working just as quickly.
If you visit the Midway website
and look for winchester bulk bullets for the .223 you will find them to be quite inexpensive if you buy 200 or 500 at a time. The once used mix .223 brass is also very reasonable. You should be able to load a zillion rounds that would fit your needs for accuracy and cost. You mentioned that a good share of your shooting was walking and plinking so you don't need high end components. Your accuracy will come from being able to adjust your powder for your gun.
The big clincher is the initial outlay for the reloading gear. Again, you don't need high dollar dies and what not to meet the needs you described but get a good press and a good scale and don't underestimate the value of a case tumbler. A small to medium sized one will do but it will save you tons of time cleaning your dirty brass. Lastly I would say, with great importance, plan ahead. Buy a system that will let you grow and that gives you good flexibility. Spend the money on the future or you will constantly be wishing you had bought something better.
You will find that you can make up the cost of the reloading gear in money saved over the cost of factory ammo but it might take a few years depending on how much you shoot. The fastest rewards will be (possibly greatly) improved accuracy and the pride of shooting something (or many somethings ) with ammo you made to your choosing for your gun.
And remember, Safety first and consistancy is better than speed. Finding a consistantly predictable load in safe pressures is much better than squirting molten lead at dangerous pressures.