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As a rule of thumb, I think for “heavy shooting days” (to be alternated with light days and medium days and rest days) you should be shooting double the number of arrows in your most rigorous current round. So, that would make it 120 arrows for heavy, maybe 60 arrows for light and 90 arrows for medium. (For NFAA indoor archers you’d have to double these as an indoor 600 round is 120 arrows, 5-3 scoring.) As one’s championship desires become greater, those get upped. Many Olympians preparing for the Olympics do 400 arrows per day for their heavy days. The idea here is if you know you can shoot 120 strong shots in a day (as you have done it repeatedly) then shooting 60 strong shots is a piece of cake. On rare occasions you might want to do a super load day and shoot a much larger number of shots: in the scheme above, maybe 200-240. This is the psychology behind the 1000 Arrow Challenge, once you have shot 1000 arrows in a single day, it is very hard for you to respond with “I can’t do that” for almost anything else in archery.
You have to prove to yourself that you can shoot large numbers of quality shots. Each shot you shoot has to be with your full physical and mental shot routines. If you cheat and just “fling arrows” to run your count up, you will know this and the “experience” won’t really count.
Now, this is a very experience archer I am talking to. If he were less expert, the rules are quite different. I express this as “you have to find your shot before you can own it.” There is no real value in shooting high arrow loads if he hadn’t yet found his shot, the shot that uses his body best, aka optimally. If he weren’t there yet, shooting high volumes of arrows would create a feeling of “normal” around a shot he needed to change. Any time an archer tries to make changes, the “old normal” exerts a pull away from the “new normal” they are trying to create and back toward the old shot, making progress that much more difficult. With this student, we rebuilt his shot a couple of years ago and now he is refining and maintaining that shot, the one he will use for quite a while. (An archery shot is never “done,” rather like a knife it needs to be honed and occasionally sharpened as it is used; otherwise it gets dull and ineffective.) The score this student made in the local tournament was almost identical to the one he made to take a medal at the state indoor championship last year, even though he struggled somewhat due to a layoff from practicing.
So, if a student hasn’t yet found her/his shot, I discourage large volumes of shots and encourage working on their shot more. A balance can be found so they can have fun competing as all archers want to do, but really, really serious archers wouldn’t think of competing without having a settled shot, so if they were rebuilding their shot, for example, they will avoid competition until they can prove to themselves in practice that their shot is up to snuff. Otherwise, under competition stress, it will probably break down and they will have a good chance of developing bad habits as they struggle to score, that will just have to be weeded out later.