From 221 to 17 FB is the least amount of work, In my experience they leave a little to be desired. But then I'm not a fan of Remington brass.
The necessary tools for the transformation of something you have an aboundance of into something you can truely use and will in all likelyhood be of better quality,
can't be measured in dollers and cents. Now time consumption is a different matter.
The time involved will take away time you share with the littleone in your avatar and that you'll need to weigh for yourself!!!
Form dies, dremel or other cut off tool(hacksaw)neck turning tools, and don't forget the annealing process.
The time spent will make brass fit to your chamber dimensions and last a long time, properly maintained.
It's actually fun to make something you can use from something just lying around.