replay a vim macro until end of buffer
Solution 1:
Personally I would do
VG:normal @x
Edit: changed register to the one you specified.
Solution 2:
You can do (in command mode)
:%normal @x
Solution 3:
make recursive macro:
qa@aq
ex:
qa0gUwj@aq
It'll UPCASE first word from current line to the end of file with single @a. But make sure "a register is empty:
let @a=""
Solution 4:
999999@x, unless you have a very large buffer...