In rt combat your character gets a lot of shots before the enemy reaches you. I never counted, but it could easily be 10 to 15 shots using a revolver that I got from the doc. Using slower guns of course slows this down, but not as much as switching to TB mode would. In tb combat you may have 3 or 4 shots and then you're face to face with the enemy.
That only confirms that some aspects of combat are indeed broken. There should be no difference in how many shots you can get off in real-time vs turn-based.