I'm not a PRS competitor and would only qualify as a hobbyist, but positional shooting/dryfire practice would be my bet. The part of long-range shooting that's most challenging for me is getting into a solid position with natural point-of-aim and good breathing within a limited amount of time. For me, it's get into position, look down scope, lose the target, adjust position, look down scope, find the target, close eyes, open eyes, look down scope, adjust bag(s), look down scope, close eyes, open eyes, look down scope, check breathing, etc. I've seen pros able to get into a position and have their natural point-of-aim on target ready to take the shot without any adjustments and that's just amazing to me.

I usually don't have trouble dialing or using my reticle, and I can imagine that could change under pressure, but it's not something I go out of my way to practice.