Barrel Damage?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Limbic, Oct 19, 2009.

  1. Limbic

    Limbic Well-Known Member

    Jun 26, 2008
    I friend asked me a question this past weekend and it really stumped me. Apparently he shot three or four 7mm Ultra Mag rounds down a gun chambered in 300 Ultra Mag. Might have been Weatherby but I'm pretty sure he said Ultra mag. He can no longer get this gun to group like it did before. It has never been viewed with a bore scope. What kind of damage if any can you do to the gooves and lands by doing this. I would think the 7mm bullet would bounce in the bore, scuffing the rifiling.

    What say ye?
  2. royinidaho

    royinidaho Writers Guild

    Jan 20, 2004
    Though I've never done specifically that, I don't think it would make a squat of difference.

    I've launched several, well.......many :rolleyes: about 1/8th X 2" brass tubes down a 338 barrel without any adverse affects whatsoever.

    Also with the 0.012" air space around the .284 bullet there would be a probable cushion around the bullet???

    Next time he does it tell him to use try a paper patch. It may help.:D

  3. phorwath

    phorwath Well-Known Member

    Apr 4, 2005
    I tend to agree with Roy. My gut tells me it's not a good thing to do, but I'd be surprised if it destroyed the accuracy of the barrel. I suspect he's got a mental block. Clean the barrel well and shoot a group for him. It'll probably shoot just as well as it did before. I doubt that there will be very many that can speak from vast experience. Sounds like Roy's got some, but I can't quite figure out why he's shooting brass rivets down his barrel... :) :D
  4. 7mmRHB

    7mmRHB Well-Known Member

    Jan 12, 2005
    Sounds like Roys forward ignition experiments were having some small failures. I don't think he's ever fessed up on that one before ?? ------ RHB
  5. elkaholic

    elkaholic Well-Known Member

    Dec 4, 2008
    I don't think 3 rounds should have much affect. I've fire formed a few 25-06 live rounds in my 6.5-06 A.I. Roy, I'm from Id. too........what do you hunt with rivets:D:D
  6. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004
    I don't think he hurt the barrel but if he cut high pressure grooves in it (Like a blown primer does when the gas hits the bolt face) he may have.

    The only way to check this it to use a bore scope and take a look.

    I have heard of people shooting 223 rounds in a 7 TCU to fire form the brass but these people
    told me that the barrel was not used for hunting or matches just fire forming.