Question on choke constrictions

[Tominator]

I'll assume you mean for a 12 guage:
True Bore Dia. .729
Cylinder Bore .000 - .729
Skeet I .005 - .724
Improved Cyl. .009 - .720
Skeet II 0.12 - .717
Modified 0.19 - .710
Improved Mod. .025 - .704
Full Choke .035 - .694
Extra Full .040 - .689


No, I'm not as smart as AJ, I just looked it up.

Here's the site:

Choke Specs.

[too_pointer]

I'm not sure if that is standard for all makes or just certain ones. My turkey choke for my Rem. is .665 I believe.
too_

[AJ]

All info is correct. There is no set standard for constriction equalling a certain choke. It all depends on bore diameter and how the choke is designed. There can be a few thousandths of difference between manufacturers but still get the same performance percentage wise.

This is what constriction Briley lists for their chokes:

Cylinder .000"
Diffusion .005"
Skeet .005"
Improved Cylinder .010"
Lite Modified .015"
Modified .020"
Improved Modified .025"
Lite Full .030"
Full .035"
Xtra Full .040"
Super Turkey (Straight Rifled) .665" diameter
Turkey Hevi-Shot 12 ga. .675" diameter
Slug 12 ga. (Sabot - Twist Rifled) .720" diameter

Trulock advertises:
choke---constriction....pattern percentage in a 30" circle
CYLINDER .000" 40% at 40 yds- 70% at 25 yds
Skeet .005" 45 at 40 yds- 75 at 25 yds
Improved Cylinder .010" 50 at 40 yds
Skeet 2 [light mod] .015" 55 at 40 yds
Modified .020" 60 at 40 yds
Improved Modified .025" 65 at 40 yds
Full .030" 70 at 40 yds
Extra Full .040" 73 at 40 yds
Turkey .045" + 75+ at 40 yds

[AJ]

You are shooting #3 steel for geese? WOW! Thats some small stuff for 40 yard performance. I shot BBB and T for geese and #2 for ducks. I used a modified choke and it was acceptable.

[Tominator]

I'm not the biggest waterfowler, but #3's steel out to 40 yards for geese, even at the velocities you mention, and I do believe you will end up with a few cripples. Maybe step up to Tungsten or Hevi-shot? Or like AJ mentions, a bigger pellet.

[7th]

AJ, for that range and game, I agree. Mod works well for the #2s but I open it up some more when I use the Ts, just works better for me that way.