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What size chokes do I need?

Discussion in 'Shooting Related Threads' started by Dale in Va, Jul 16, 2011.

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  1. Dale in Va

    Dale in Va TS Member

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    I just bought a 870tc step rib 1988. I pertty sure it's the .745 barrel I can see the taper before the choke. The choke thats in it is a full trap measures .732 that only .013 of choke. I'm going to take it to the club tuesday hopfuly someone there will have a gauge. that size chokes should I get after I know the bore dia. I have a mod rem choke that is .705 that should be a full in a .745 barrel correct? Thanks dale
     
  2. Stl Flyn

    Stl Flyn Well-Known Member

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    Choke really does not matter as long as it is full!
     
  3. Hoosier Daddy

    Hoosier Daddy TS Member

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    If it says trap full and it measures .732 it is a bore of .745 that tapers to .727 before the choke. That effectively gives you .018 of choke and the .732 tube is just a thread protector. I have that same type barrel on an 11-87 and it works very well back to 20 yards. A improved cylinder choke tube of .720 will give you .025 choke or effectively an improved mod and a modified choke tube of .710 will give you a .035 or full choke good to the back fence and beyond.
     
  4. Chichay

    Chichay TS Supporters TS Supporters

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    The proof of the pudding will be in the patterning?
     
  5. chipking

    chipking TS Member

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    Dale where in VA are you. I have a bore gauge and would be happy to help you measure your barrel. I live in Fredericksburg. PM or e-mail me

    --- Chip King ---
     
  6. Oregunner

    Oregunner Well-Known Member

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    Remington Trap (Old Style / pre-2000)

    Chokes


    Super Full Trap (Lead Only) 0.745 / 0.727 0.690 0.055

    Extra Full Trap (Lead Only) 0.745 / 0.727 0.709 0.036


    Full Trap (Lead Only) 0.745 / 0.727 0.732 0.013

    You can use the regular Remchokes, but they won't be the constriction marked on the tube, ie IC etc.

    The first column is bore diameter, the second the diameter of the choke and the third the restriction. The bore diameter is 0.727 on all of the tubes and the diameter and constriction have to equal the .727 The order is from the tightest constriction down to the most open.

    Full (Steel or Lead) 0.727 0.691


    Modified 0.727 0.709


    Improved Cylinder 0.727 0.718
     
  7. Hoosier Daddy

    Hoosier Daddy TS Member

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    Oregunner, the .745 to .727 yeilds a choke of .018 that is not overcome by the enlargement of the bore in the last few inches of barrel thus the constriction of a trap full is .018, not .013. When figuring the constriction of the choke the .018 factored into the barrel must be considered on all measurements. Your figures are accurate on the super full and extra full but the regular trap full would be .018 and the .032 choke tube is just a thread protector.
     
  8. Gapper

    Gapper TS Member

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    I found these step bore barrels finicky in that none of the supplied tubes (3) would give good results (score wise). I ended up using a carlson's IM for the std barrel. .705 I think. Good luck.
     
  9. Dr.Longshot

    Dr.Longshot Banned Banned

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    The Big Uns
     
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