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A few years ago the maximum legal shell for trap shooting was defined as 12 ga, 1 1/8 oz, 3 dram equivalent (drm eq). SAAMI defined a 12 ga 1 1/8 oz 3 drm eq load as having a velocity of 1,200 f/s plus or minus 5% ie 60 f/s due to manufacturing tolerances. So a legal load could have a velocity range of 1,140 f/s to 1,260 f/s. Sooo the ammo makers started making a "3 drm eq" load that had a velocity of 1,255 f/s and calling them Handicap drm eq, when in reality it was a 3 1/4 drm eq load that gave the long yardage shooters less of a handicap when shooting against the shorter yardage shooters.
Now maximum trap loads are defined: 1 1/8 oz 1290 f/s; 1 oz 1325 f/s and 7/8 oz 1350 f/s.
HDCP means handicap, generally for shooting trap. At 16 yards from the house (the close distance) lower velocity shells are used. From 20 to 27 yards back faster velocity shells are common. There is a limit velocity based on shot weight for legal shells.
@Stomper is a real man of course, but after 600 shots over a weekend, most of us will notice 100 fps.
Dram is old school conversion from black powder days. Velocity is more common (and useful) now. 2 3/4 dram are light target loads, 3 dram are heavy (faster). I still note my reloads in dram.
Edit: Typo