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I think doctrine is to limit the user to firing something like 3 rounds a day (or maybe even per week) to avoid TBI.
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Correct, mostly. Different rounds have different limits. I can't recall the limits now, it's been too long.
I came close to getting to fire one. I was in AFG as a civ supporting some SEALs and they wanted some work done that wasn't very close to the top of the priority list. I told them I would put in extra hours each day (we were paid flat daily hours but we could always put in extra unpaid hours if we wanted). I told them I would do it if I could shoot the Carl G. I was already going to the range with them to shoot small arms so it wasn't a huge stretch to do the Carl G. Unfortunately before the work got done they decided they no longer needed it done, and I didn't get to shoot a Carl G. One of the other guys in our project did get to shoot one. He was bummed that he was missing turkey season back home so the SF team he was supporting bought a turkey at the local bazaar and let him shoot it with a Carl G flechette round because they didn't have a proper turkey hunting shotgun in the armory and the flechette round was the next best thing.