HPFN - What does HPFN stand for? The Free Dictionary
References in periodicals archive
I tried the Federal 300-grain Sierra Pro Hunter HPFN
at 1,860 fps and found it manageable and accurate.
Top velocity with the Sierra 300-grain HPFN
was 2,177 fps with 62.5 grains of Benchmark, which produced a muzzle energy of 3,158 ft-lbs.