Good points all and have to agree that it is safer to do the check at 75% for many reasons
but does the check itself mean as much?
I thought mag.s should be checked at 'full chat' to get an accurate assessment. Also,
now the 7% isn't 7% of 100% but 7% of 75%
(ie. closer to 10% of 100%).
That has to be a larger allowable drop before the fail/pass limit is reached?