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Understanding Shotgun Chokes

Discussion in 'Competition Shooting' started by SHOOTER13, Sep 13, 2011.

  1. oli700

    oli700 12g Supporter "Philanthropist"

    thats right , a 410, still should be the same. Rifled Fosters were made for any choke up to full, beyond that I dont know because I have never even heard of extra full or whatever it’s called. I wouldn’t give it a second thought. If you feel unsure take the first shot show her its ok.....if the barrel splits it will make a cool story at least.....lol.
  2. Rossignol

    Rossignol The Original Sheriff Staff Member Global Moderator Moderator Sponsor

    Alright be lookin for pics of a split barrel and a hospital stay. I'll try to find them in 2 1/2" shells.

    Here comes the,
  3. SHOOTER13

    SHOOTER13 Guest

    This chart will give an idea of what choke to use at what yardage for sporting clays... with the caveat that ammo, intended target, angle of presentation ( front, back, side ) also weigh in on the equation...



    Red - Pattern too small | Yellow - small but usable | Green - Optimal Pattern


    Choke Tube Selection:

    Choke tube selection is a confusing issue amongst a lot of shotgunners but one that is easily explained.

    The real reason you want the right choke is to be able to place at least 70% of the shot in a 30" circle at 40 yards... the minimum / maximum pattern kill zone... meaning the pattern will cleanly kill anything in this circular zone.

    Selecting the correct choke tube is nothing more than moving that same exact pattern to different yardages. In other words... if you want to shoot at a target 20 yards away then select a choke tube that gives you 70% of the pattern in a 30" circle at 20 yards...same if shooting at a target that is 45 yards away, select a choke tube that will give you 70% of the pattern in a 30" circle at 45 yards.

    Extra Full Choke: ...................delivers a 70% pattern at 45 Yards.
    Full Choke: ............................delivers a 70% pattern at 40 yards.
    Modified Choke: ....................delivers a 70% pattern at 35 yards.
    Improved Cylinder Choke: ....delivers a 70% pattern at 30 yards.
    Cylinder Choke: ....................delivers a 70% pattern at 25 Yards.

    ripjack13 likes this.
  4. DaveinCT

    DaveinCT 20g

    Really good post, SHOOTER.. :cool:
  5. SHOOTER13

    SHOOTER13 Guest

    Thanks Dave !!

    I was doing research anyway and figured I would share the wealth of information I found with everyone across the boards...
  6. coopshoot

    coopshoot Copper BB

    Thank you Shooter13 for this excellent thread. Very informative for the beginner shooter! I'm gonna print this baby out . . .
    SHOOTER13 likes this.
  7. LTB45

    LTB45 .30-06 Rest in Peace Supporter

    FANTASTIC job!
    This thread is very informative!
    It took me quite a long time to firgure all this out reading tons of post on Shotguworld for a few years.

    This should be sticky'd to the top of ths section.
    Everyone that starts out shooting shotguns should,have this info available to them.

    ripjack13 and SHOOTER13 like this.
  8. SHOOTER13

    SHOOTER13 Guest

    Glad to be of assistance gentlemen...
    ripjack13 likes this.
  9. rjpoog1989

    rjpoog1989 20g

    This is a good thread. A lot of this I knew, however, some new things in here as well. This is all a must for new shooters!
    SHOOTER13 likes this.
  10. SHOOTER13

    SHOOTER13 Guest

    I appreciate the kind words...thanks !
  11. Rankings

    Rankings .22LR

    A lot of good read here, wow. Thanks!
    SHOOTER13 likes this.
  12. MossyMilDot

    MossyMilDot .270 WIN

    Shotgun Chokes Constriction Diameter


    Great post and very informative. ;)

    What are the Mossberg Accu-Choke Tubes official Diameters?

    Example would be Carlson's, but these would or may be slightly different.
    Item # Constriction Diameter
    12217 Cylinder .730
    12211 Skeet .725
    12212 Improved Cylinder .720
    12213 Modified .710
    12214 Improved Modified .705
    12215 Full .700
    12216 Extra-Full* .690
    19891 Turkey* .680
  13. John A.

    John A. Unconstitutional laws are not laws. Staff Member Administrator Global Moderator

    Mossberg modified accu choke = .716
    LAZY EYED SNIPER likes this.
  14. Robert Brock

    Robert Brock Copper BB

    This is only my 3rd post and I'm blown away at all the great info. I also have been wanting a more fluid view of chokes and this answered all of my questions. Thanks folks!
    SHOOTER13 likes this.

    LAZY EYED SNIPER Overwatch Staff Member Global Moderator Supporter "Philanthropist"

    I'm a few more posts in and these guys still impress me every day...
    SHOOTER13 likes this.
  16. tattooo

    tattooo .30-06

    Really helpful. ....thanks
    SHOOTER13 likes this.
  17. ripjack13

    ripjack13 Resident Sawdust Maker Staff Member Administrator Supporter "Philanthropist"


    good info you may have forgot was here....
    Rossignol and SHOOTER13 like this.
  18. GunnyGene

    GunnyGene Racist old man BANNED

    Here's a shot sequence that shows how the shot cluster develops after leaving the barrel. This is a 12 gauge shell using a shotcup, and pics are a series of individual 1/1,000,000 second exposures showing shotgun firing shot & wad/cup separation. Distance covered is about 6 ft.

    ripjack13, Rossignol and SHOOTER13 like this.
  19. Rossignol

    Rossignol The Original Sheriff Staff Member Global Moderator Moderator Sponsor

    There's stuff in here I've not seen before, some pretty cool stuff in fact, thanks!
  20. ripjack13

    ripjack13 Resident Sawdust Maker Staff Member Administrator Supporter "Philanthropist"

    Right on man...
    SHOOTER13 likes this.

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