I have been saving all my brass since i began shooting a few years back. I now want to begin reloading. I have shot only factory Remington, Winchester and Federal since the beginning.

On average, how many subsequent time can i expect to be able toreload 1 case using the factory stuff mentioned above before they should not be reloaded again.
I know there are several factor involved, including cartridge,but i'm only looking for an idea of how many times. I don't know if it's once or 20 times.

I have saved brass for my

7 winmag
243 win
30-30 win
270 win (although i no longer have the 270 but have over 500 empties)