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Is Your Forcing Cone Polished?

Discussion in 'Uncategorized Threads' started by CharlesR1100, Feb 15, 2008.

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  1. CharlesR1100

    CharlesR1100 TS Member

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    You can't see it by holding the barrel up to a light source. The F/C then appears to be a dark circle about 1/2 inch wide. So how can you check the length and the surface of the F/C?

    From the choke end of the barrel push a clean, white piece of paper or better yet a clean, white cleaning patch up the barrel to a point just short of the forcing cone. Put a light source near the chamber end of the barrel. By looking into the barrel, the cleaning patch, or paper will reflect the light back and the forcing cone can be seen. You can then determine its length and whether it needs polishing.

    I found this tip in an old post by Neil Winston. He is also good with book reviews, and he knows his stuff.
     
  2. zzt

    zzt Well-Known Member

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    I just drop a fiber optic light down and it shows everything. When I got my new 35" MX-15 barrel I was not impressed with the factory polishing on the forcing cone, so I made Giacomo repolish it. Now it is satisfactory.
     
  3. hmb

    hmb Well-Known Member

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    Did you ever think of using a bore guage and get the dimensions to nearest .001 of an inch? HMB
     
  4. Paladin

    Paladin Well-Known Member

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    Yes,,bought that,,and also a Hawkeye bore scope so you can see EVERYTHING.
     
  5. Brian in Oregon

    Brian in Oregon Well-Known Member

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    Rem 870s, 1100s and 1187s have had rougher than hell forcing cones for quite some time now. So far the only drawback appears to be they take more work to clean. I've been meaning to ream mine out, but haven't got around to it yet.
     
  6. sako2115

    sako2115 TS Member

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    I am lucky, have a proctologist friend who likes looking at things that are in a tube and in the dark. He checks the barrels for me as part of the bi-annual check up since the equipment is dirty anyway.
     
  7. Onceabum

    Onceabum TS Member

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    LOL...Good one Sako!
     
  8. ken a

    ken a Member

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    Sports shot, beat me why they want to polish forcing cones. Must be a long winter and nothing else to do.
     
  9. zzt

    zzt Well-Known Member

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    Sportshot, because it makes cleaning easier. It abrades the wad less so less plastic is deposited in the barrel above the cone. Also, as an ex-machinist, lousy finishes on machined surfaces offend me.

    Others believe it produces more magical properties such as higher velocity, increased consistency and better patterns. Maybe it does, maybe not.
     
  10. zzt

    zzt Well-Known Member

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    Yes, the forcing cones on the Rizzini BR320 sporter are long, polished, without even a lip at the end of the chamber, and chrome plated. You simply cannot tell.

    Long (4" to 5") cones done start to finish with a Sunnen hone or equivalent provide excellent finishes and are hard to see.
     
  11. m70win

    m70win Member

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    Wouldn't rough forcing cones slow the wad down so you don't get the dougnut shaped patterns?

    Tim
     
  12. phirel

    phirel TS Member

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    Tim- How can a wad get in front of the shot to produce a hole in the center pattern?

    Pat Ireland
     
  13. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    The only "dough nut hole" pattern I've seen was in SS mag. in the joke department. May be able to create one using a single #1 buck in the base surrounded with shot to equal an ounce load? That big hunk plowing thru the smaller mass fairly quick might produce one? :) Hap
     
  14. hmb

    hmb Well-Known Member

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    K-80 cones are polished. HMB
     
  15. Neil Winston

    Neil Winston Well-Known Member

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    Hap, if you look at the illustration section of James Russell's fine book you will see several drawings of doughnut hole patterns, one with that title. There are no photographs, unfortunately . . .

    Neil
     
  16. Hap MecTweaks

    Hap MecTweaks Well-Known Member

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    Maybe if I'd place a cheerio on top of my shot, nah, that won't cut it either.

    Neil, I think Mr. Russel mis-understood a lot of what he was told? And, his writing abilities were just a notch above mine and I can't write! Hap
     
  17. m70win

    m70win Member

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    Pat I'm pretty sure I read about it on the internet somewhere so it must be true.

    Tim
     
  18. shot410ga

    shot410ga Well-Known Member

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    You can hone forcing cones with a brake hone.
     
  19. AveragEd

    AveragEd Well-Known Member

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    I was told that at one time, someone made barrels that had no forcing cone - they were evenly tapered from chamber mouth to muzzle. In effect, they were "all" choke. I don't recall who made them but as I remember, they were highly regarded.

    Ed
     
  20. darr

    darr Well-Known Member

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    I aint goin there
     
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