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Old May 2, 2013, 12:12 PM   #1
exnodak
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Slugging 9mm Barrel

I want to slug a 9mm barrel to determine the true groove diameter. I am getting severe leading, so I suspect it is somewhat undersize for the lead bullets I am using. Would it be OK to use a .358 diameter Brinnell 12 bullet as the slug, or do I risk getting the bullet badly stuck in the barrel?
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Old May 2, 2013, 03:37 PM   #2
g.willikers
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It would depend on how big a hammer you have.
I use soft lead fishing sinkers.
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Old May 2, 2013, 04:01 PM   #3
Jim Watson
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I think it more likely your bullets are undersize for the barrel.
A soft .358" bullet ought to work... if the barrel is not larger, as some are.
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Old May 2, 2013, 04:48 PM   #4
exnodak
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The bullet I have in mind for the slug is a Missouri Bullet 158 grain SWC that I use in 38 special. It should be oversize for the 9mm, but since it is harder than pure lead, I am leery about it being too difficult to get thru the barrel, and possibly getting really stuck.
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Old May 2, 2013, 09:32 PM   #5
huh
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I was under the impression you want to use a egg sinker with the hole for the fishing line to go through so you don't get "spring back"
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Old May 3, 2013, 02:50 PM   #6
exnodak
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I appreciate all the comments, but again - does anyone have an opinion or experience on my original question about using a soft bullet meant for 38 Special as the slug for a 9mm barrel?
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Old May 3, 2013, 04:59 PM   #7
45_auto
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Quote:
Would it be OK to use a .358 diameter Brinnell 12 bullet as the slug, or do I risk getting the bullet badly stuck in the barrel?
I don't consider a bhn 12 to be soft. However, you won't get it stuck as long as you have a big enough hammer and an appropriate range rod.

Do you have something against a pure lead sinker with a bhn of about 1/3 of the bullet you're talking about?
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Old May 4, 2013, 06:38 AM   #8
Dixie Gunsmithing
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You don't need it hard, as you only want to swedge the bullet with the rifling to measure it when you drive it through. You could even cast it with Cerrosafe, as it hardly shrinks after its cooled, and is made for this. Just drive it out within minutes after its cooled, and you'll have a replica of the barrels lands and grooves. Just use around enough to equal a bullet, plug the muzzle with a wadded up patch, pour the Cerrosafe from the breech end, and drive it out the muzzle end after it reaches room temp. Remember to clean the barrel before firing it.
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