If it's any consolation Bio, you're not the only one that overlooked the ".25 cal or larger" part. Nor (I speculate) suffering from brain damage. I find a good blanket excuse for brain farts to be, "I probably had too much fun in the sixties, seventies, and eighties; and ALL TWO of my surviving brain cells are currently on hunger-strike".
"But at least I stayed busy and out of trouble for a few minutes anyway." I also consider every unincarcerated minute 'progress'.