любопытно.
Вот тут большая терка про Optima HP чоки
http://www.shotgunworld.com/bbs/viewtopic.php?t=369777вот моя выборка
Beretta bore diameter .732 " (18.6mm)
Это стандарты сужений: Constriction Percent (by Trulock choke company)
Cylinder .000 40 at 40 yds- 70 at 25 yds
Skeet 1 .005 45 at 40 yds- 75 at 25 yds
Imp Cyl .010 50 at 40 yds
Skeet 2 (lite mod) .015 55 at 40 yds
Modified .020 60 at 40 yds
Imp Mod .025 65 at 40 yds
Full .030 70 at 40 yds
Extra Full .040 73 at 40 yds
Turkey .045 Plus 75 PLUS at 40 yds
= = = = = =
А это реалии Optima HPEdit #2: my assistant and I measured the IC twice (he's 18 months old, first time with a caliper)...LM is new and corrected!
Given that highly technical reasoning, I took a series of measurements of each of my chokes. Here is what I ended up with:
Cyl: avg .730, observed range of .729-.731 (fairly clean)
SK: avg .725, observed range of .724-.726 (fairly clean)
IC: avg .719, observed range of .719-.720 (x1 .720 measurement, clean)
LM: avg .713, observed range of .712-.713 (updated!, doh!, clean)
M: avg .709 (!), observed range of .709 (no deviation, somewhat clean)
IM: avg .703 (!), observed range of .703 (no deviation, somewhat clean)
F: avg .695, observed range of .694-.695 (fairly clean)