XTR
F-TR obssessed shooting junkie
In my experience shooting F class matches with 20 shots for record and unlimited sighters, I usually take three to five, I can get through the first string just fine, but by shot 13 it's getting swimmy, and by the time I get to shot 15 it's downright bothersome. I don't think BR shooters shoot as many shots. That probably has a lot to do with what you see and your need. I don't go to the line w/o one unless I forgot it, and I usually carry two just in case.