Great choice! That quote from Theodore Roosevelt is truly inspiring. One of my favorites is: "Success is not final, failure is not fatal: it is the courage to continue that counts." – Winston Churchill. Looking forward to seeing more uplifting quotes!
In theory, yes, removing a 20 MOA rail and dialing up 20 MOA should bring you back to your original zero. However, minor differences in mounting tolerances and scope tracking can cause slight variations.
Nosler Zipedo bullets were an older design, known for their flat-base and good accuracy. They weren’t as popular as Ballistic Tips or Partitions, but they performed well for varmint and target shooting. If they’re in good condition, they should still be usable.