being a handloader for mostly military type rifles (ar15, m1 garand, sks) with the longer than normal throats, ive not had an issue with jumping vs jamming with anything ive loaded (that and being too worried about overpressure to ever jam anything,,,,,, not suggesting you shouldnt do it, as im sure you watch your pressure)
but,,,,,,,,,,,,,,
i do have several semiauto rimfire rifles with match grade barrels and super tight chambers, and as you probably know, once a round is chambered in a semiauto match rimfire chamber,,,,, more often than not, there aint no pulling that puppy back out. you must shoot it out, so thats exactly what i do, right after the horn sounds.
my range officer is aware of this (i made him aware of mine, but he understands the concept) and has no problem with it......it sounds as if your case is different by virtue of some thick headed management. of course hindsight being 20/20, i would never disclose info that they didnt need to know again. when the horn sounds, just extract the round (or primed case) shake the powder out of it, and sit it on the bench with bolt beside the rifle. then, when the line goes hot tap your bullet out.
lol, you were probably just kinda making casual conversation with the guy and he went off on a campaign to protect the world with superior knowledge and expert bomb disposal skillz.