Amen to KraigWY
Lest anyone have the illusion of 'modern combat competition' as reality, pray rid yourselves of it.
Actual defense circumstances happen typically close and the first shot or two are the crucial ones. The 'thirty round burst', so beloved of 'combat' matches are simply amusing pastimes. They can teach some good skills, but they do NOT reflect reality in any large measure.
The most important defensive round fired - in any given circumstance - will be one's FIRST shot.
Reloading is of some import, but making hits is more critical. Far more critical.
Attributed to Teddy Roosevelt: "Rapidity of fire cannot make up for inaccuracy of fire" - or words to that effect.