1. Attention: We have put together a thread with tips and a tutorial video to help with using the new software. Please take a moment to check out the thread here: Trapshooters.com Tutorial & Help Video.
    Dismiss Notice

870tc barrel

Discussion in 'Shooting Related Threads' started by leadshot, Jul 17, 2012.

Thread Status:
Not open for further replies.
  1. leadshot

    leadshot Member

    Joined:
    Aug 9, 2010
    Messages:
    78
    can anyone tell me what after market chokes to use to to get mod choke in this overbored barrel thanks
     
  2. CalvinMD

    CalvinMD Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    9,857
    Location:
    Northeastern MD @ the top o the Bay
    A regular skeet Remchoke should be very close.....it measures about .723 or .005/.006 in a regular barrel that mikes .727-.728..so that puts it at around .722....in a .745 barrel it would give you about .13 and mod is generally considered .15pts...hope that helps, I've used a regular Rem-IC in a factory big bore and it worked awesome
     
  3. wayneo

    wayneo Active Member

    Joined:
    Jan 29, 1998
    Messages:
    3,002
    Huh?????????

    Wayne
     
  4. short shucker

    short shucker TS Member

    Joined:
    Jan 29, 1998
    Messages:
    3,939
    The big bore Remington TC choke tube barrels have a .018" step in them before the choke section. This must be figured in when setting up a choke with the proper restriction. So you have .018 to start with and then a typical SK choke will be .005. The resulting constriction is .023 which would be between M (.020") and IM (.025").

    ss
     
  5. CalvinMD

    CalvinMD Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    9,857
    Location:
    Northeastern MD @ the top o the Bay
    Yup..the skeet remchoke would probably do just what you want
     
  6. Gapper

    Gapper TS Member

    Joined:
    Feb 26, 2010
    Messages:
    823
    Because the barrel constriction is a little ways before the choke constriction (about 3/4 inch), it does not have the cumulative effect one might imagine.

    I used an IM (carlson's), it gave better averages at 16 yds than all other sizes tried. The factory supplied rem-chokes (full, trap full), worked poorly in this step-bore barrel, but worked well in a std. bore 1187.
     
  7. leadshot

    leadshot Member

    Joined:
    Aug 9, 2010
    Messages:
    78
    thanks for the help...this 870tc overbored barrel was new to me
     
Thread Status:
Not open for further replies.