If you haven't searched Practiscore, I would start there.
I think you will be hard pressed to find rifle only comps or comps where tactics is a priority.
2 gun is getting more common where the AR dominates, and you use a pistol.
PCSL is becoming popular, but it isn't based on using any tactics and is purely an "action" type event.
Maybe search for "Minuteman" events. They seem to be rifle focused with tactics as a priority, but there are few of them around and normally held by local clubs without alot of advertising. I still don't think you will get away from needing a pistol.
PractiscorePCSLMinuteman