Barrel Damage?

Limbic

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Joined
Jun 26, 2008
Messages
323
Location
Jackson Ms
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?
 

royinidaho

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Joined
Jan 20, 2004
Messages
8,950
Location
Blackfoot, Idaho
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
 

phorwath

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Joined
Apr 4, 2005
Messages
7,005
Location
Alaska
:D
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

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
 

7mmRHB

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Joined
Jan 12, 2005
Messages
341
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
 

elkaholic

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Joined
Dec 4, 2008
Messages
9,845
Location
hauser, id.
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
 

J E Custom

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Joined
Jul 29, 2004
Messages
10,725
Location
Texas
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.

J E CUSTOM
 

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