rifles:
brass headstamp
primer make, size, and number
bullet make, weight, style
powder make, type, charge weight
velocity
standard deviation (and if specialty loads, extreme spreads)
smallest group, largest group, and average group at 250 yards
notes: load density, metering, or any notable inconsistencies
handguns:
powder make, approximate charge weight, and number
bullet make, weight, style
primer make, size, and number
velocity
standard deviation
power factor
energy
average group size at 25 yards
notes: notable weirdness
i'll also keep track of the gun itself... like if point of impact shifts or first shot is wildly out of the group, if there is differences in poi w/ weather changes, and finally, how well do i shoot the rifle (approx hit rate on a prairie dog town for dogs beyond 300 yards - and yes, i've had 'em all on a dog town... a day of dogging w/ a 338 win mag and 300 win mag will really wear ya out in a short period of time).