I (and many others) will argue that ANY competition shooting you do WILL BE tactical in some form or fashion...meaning that the skills and disciplines you are learning would increase your success in a tactical situation. Just the fact that the stress / anxiety of competing and wanting to do well (and not embarrassing yourself) is good at numbing the auditory/visual/mental exclusion that will occur in a real situation when the adrenaline hits and the brain goes into overload. It's not the same, but it will lessen the effect. Just the fact that your brain is able to process more of what's going on around you, and the confidence in your shooting becomes more a given increases your survivability.
When I used to shoot IDPA, we used to laugh at the new people starting IDPA who's shooting skills fell completely apart as soon as their feet started moving even a little bit. We were NOT making fun of them, just laughing at remembering how WE ALL had that happen ourselves. But even within a few sessions those same shooters were improving leaps and bounds because their brain was focused on what was needing to be done and their body was simply responding.