Of course they do. https://www.milsurps.com/showthread.php?t=43993&page=2
25 shots in 1/2 hr. Full load at 300 meters. I don't pretend not to feel it, but holding a rifle butt is rather like holding a horse's hind leg for the farrier - you have got to hold it tight up against you. The trouble (with horses and rifles) comes when you are apprehensive and, precisely because of that, do not hold it tight enough. Give it a bit of space and it - horse's leg or rifle butt - can accelerate enough to really hurt you.
It's not clear to me - what exactly is the challenge?
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OK, just deciphered the soundtrack. 40 shots prone in one session would certainly be an afternoon to remember. Having already been operated on the shoulder, I think I'll give it a miss!