Overbore problems in winter shooting?

Discussion in 'Trapshooting Forum - Americantrapshooter.com' started by rrisum, Jan 13, 2020 at 6:35 PM.

  1. rrisum

    rrisum Mega Poster

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    Does cold weather effect extreme overbore performance? --Wad sealing problems? Shot with a friend shooting a Kohler .750 bore in sub -0 wind chill --His shells just didn't sound right. -- cold shells verses warm shells? -- More we brought it up the lower his scores went. -- Mind over matter? -- Bad loads? -- Just asking if anyone else have noticed this?
     
  2. Shamus

    Shamus Member

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    Find out what ammo. Some estates act up in cold if left in a vehicle over night in cold. Older aguilas had a wad issue but was supposed to be taken care of.
     
  3. Smokintom

    Smokintom Mega Poster Founding Member

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    Yes it can and will in very cold weather. Happened to me some years ago and switched back to my M12 and the problem went away. But it was very cold too.
     
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  4. mudpack

    mudpack Well-Known Member Founding Member

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    Doubt if wad sealing was the problem. When the shell fires, the wad skirt (the part that seals) is instantly exposed to extremely high temperature since the burning propellant is directly behind the skirt.
    I'd say it was a mental thing, since cold temps won't reduce muzzle velocity by more than about 10%, which is not enough to affect shot placement.
     
  5. Ken Cerney

    Ken Cerney Elite Poster Founding Member

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    When I had my 3200 with Stan Baker .780 bore top single I could not shoot it when it was 20 or under. New shells went like 1/4 load POOF It is definitely a problem in large bore barrels.
     
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  6. mudpack

    mudpack Well-Known Member Founding Member

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    If the powder was burning completely yet not being sealed by the wad, the resulting "bang" should still be the same; same amount of gasses coming out the muzzle.
    If you're getting a squib-load's POOF, then incomplete powder burn would be the issue.

    I shoot a ton of shells through my overbored barrels in temps down to below zero Fahrenheit. I've never had a problem with wads. Oh, yeah, I'm a duck hunter......
     
  7. Ken Cerney

    Ken Cerney Elite Poster Founding Member

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    mudpack what is your bore diameter?
     
  8. mudpack

    mudpack Well-Known Member Founding Member

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    One of my duck guns is a Browning using Optima-Plus, which is their overbored barrel, I'm told.
    The other duck gun is a Beretta using OptimaBore Plus, which Beretta describes as "featuring an overbored barrel".
    Perhaps you'd know what those bores are, I do not.
     
  9. mudpack

    mudpack Well-Known Member Founding Member

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    Just measured the bores, Ken. The Browning is .740", the Beretta is .730".
     
  10. Ken Cerney

    Ken Cerney Elite Poster Founding Member

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    In my experience usually you don't have a cold weather issue under a .750 bore. Most standard barrels are .727 so anything over that they list as "overbore"
     
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  11. mudpack

    mudpack Well-Known Member Founding Member

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    You bring up some good points.
     
  12. pepsiguy

    pepsiguy Member Founding Member

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    Mabe that is why Kolar went back to 740 bore.
     
  13. Ken Cerney

    Ken Cerney Elite Poster Founding Member

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    I know some with the .750 bore had problems in this cold Wisconsin weather.
     

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