Some of my practice sessions easily exceeded 250 to 300 rounds.
Sometimes as much as 400, and that was much lower than some of the other folks.
But without losing any skills, I eventually got the practice round count to less than 100, and quite often even less.
It just took some planning and realizing that was more useful.
For example, for weak hand practice, this method worked very well:
Draw, transfer gun, shoot two rounds, repeat as necessary.
For an added bit, reload between double taps using what ever method works.
Another version is to change back and forth between strong and weak hands every two rounds.
For general stage practice, draw and double tap one target, reload and run, (or run and reload, depending on the game rules), to a second shoot box, then double tap the same target.
Using two targets, double tap one, swing to the other, double tap that one, back to the first one, and so on, with an occasional reload in between.
Repeat until satisfied.
And so on, practicing specific skills as needed or desired.
Cuts way down on the needed ammo and even the number of targets and seemed to actually make an improvement in skill development over previous higher round methods.