Every USPSA classifier has a High Hit Factor, or HHF — the hit factor that equals 100% on that course of fire. It is the yardstick your score is measured against, and it is worth understanding.
What the HHF actually represents
A classifier's HHF is the benchmark performance for that exact stage. Shoot a hit factor equal to the HHF and you score 100%; shoot half of it and you score 50%. Because each classifier has its own HHF, a 5.0 hit factor might be 70% on one classifier and 90% on another.
HHFs are per division
The same classifier has different HHFs in different divisions — an Open gun and a Production gun do not produce the same speeds, so each division gets its own 100% bar. Always read the HHF for the division you actually shoot.
Why HHFs change
USPSA periodically recalibrates HHFs as equipment, technique, and the talent pool evolve. When an HHF goes up, the same hit factor is worth a slightly lower percentage than before; when a new classifier is released, it may not have a finalized HHF yet at all. That is why a score from two years ago can look different against today's bar.
Reading HHFs without the headache
Related reading: Hit factor math, step by step · How USPSA classification works
MatchChaser keeps a maintained, sortable reference of every active classifier with its current HHFs by division, and uses them to compute your percentages automatically the moment you log a score. See the full classifier catalog — free to browse.