Erik -

The number of rounds fired are not as improtant as the type of firing you do. For example, one should practice shooting from field positions, concentrating on off hand and snap shooting. I think you should also train yourself to shoot off hand after a hard run which leaves you out of breath and your heart rate elevated. Another drill I like is to have a 5 gallon plastic pail tied behind a quad or a Jeep, position yourself between the two, and try to hit the pail as it jumps and rolls towards you. When live fire is not possible, dry fire as much as you can stand. Keep the ranges short, and work on obtaining fast sight pictures and quick trigger releases.

Mike