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  #1  
Old 11-14-2018, 12:08 PM
capo602002 capo602002 is offline
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Default slugged mini 30 barrel -

I recently slugged the barrel of a stainless mini 30 I have. The slug went in from the muzzle end fairly tight...for the first inch - then dropped almost free until the last 2 inches before the chamber where it got tight again. Anyone seen this before? On any barrels?
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Old 11-14-2018, 1:17 PM
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That's bad.
Does the barrel have a very high round count?
Is the barrel dirty or perfectly clean?

Try slugging from the chamber end, not the muzzle.
What you want is a taper from the breech to the muzzle.
The center or front of the barrel should never be looser than the breech end.
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Old 11-14-2018, 7:18 PM
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I would NEVER question you (Randall) you really do fine work, but I have to ask how in the hell do you slug a Mini 14 from the chamber end without removing the barrel from the receiver?
thanks for any information!
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Old 11-14-2018, 9:56 PM
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Quote:
Originally Posted by scamp62 View Post
I have to ask how in the hell do you slug a Mini 14 from the chamber end without removing the barrel from the receiver?
Drill through the slug until it will fit snugly on your cleaning rod.
You will need a rod with female threads.
Slide rod down the bore and out the chamber.
Slide the slug on to the rod.
Install a cap screw into the rod.
Pull the rod out the muzzle.

It helps to make a slide hammer that you can tap-tap-tap with to pull the slug.
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Old 11-14-2018, 9:59 PM
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I know people drill a hole in the rear of the 10/22 for cleaning

I think that would be insane to do on a Centerfire mini 14/30

It’s a mini- not known for accuracy.

What groups are you getting? What made you want to slug the barrel
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Old 11-14-2018, 10:06 PM
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Quote:
Originally Posted by hermosabeach View Post
I know people drill a hole in the rear of the 10/22 for cleaning
You can get away with that on a 10/22 because a 10/22 stock covers the hole.
On a mini14, the hole would be visible out the back of the reciever when the reciever is installed in a stock.
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Old 11-15-2018, 6:31 AM
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Barrel is clean - round count is unknown, but the firearm appears to have been hardly used. Slugged the barrel to verify size - slug came out .3105". Which means the barrel is probably .001 to .0015 larger in the middle. Had to use a mallet and lightly tap the slug (using dowel) the first inch - after that it basically "fell" until about 2" prior to the chamber.
Was trying to see if I could come up with a single load that would shoot great in my CZ527 and good enough in the mini30. Had read conflicting statements about the size (.308) of the mini30 barrel and wanted to verify. Since I am the second owner I wonder if Ruger would even consider looking at this gun.
The front sight is basically press fitted onto the barrel which I think is causing the tightness at the muzzle. Can't explain the tightness ahead of the chamber except a crummy barrel.
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Old 11-15-2018, 8:44 AM
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Ruger has an amazing warranty service. Hopefully they can help you out.
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Old 11-15-2018, 1:59 PM
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My understanding on mini 30's is that only some of the very first 196-series rifles had the smaller bore, all others since have a .310 bore.
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Old 11-15-2018, 7:27 PM
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Thank you Randall...your one smart cookie
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Old 11-16-2018, 6:50 AM
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Good news - Ruger wants to take a look at the rifle. So off it goes. Will post a follow up in a few months. S/N indicates a 2015 build.
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Old 11-17-2018, 4:13 PM
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Choke is good for accuracy. A tight breech end is not. This one might be a great candidate for fire lapping. I'd figure out a way to block the gas system to avoid getting grit in the mechanism.
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Old 11-17-2018, 6:37 PM
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Quote:
Originally Posted by capo602002 View Post
.../ Had to use a mallet and lightly tap the slug (using dowel) the first inch - after that it basically "fell" until about 2" prior to the chamber....
... Which means the barrel is probably .001 to .0015 larger in the middle....
As little as .0002" can cause that loose feeling. 1-1/2 thou is just a wild guess. It is also possible you hit a carbon ring at the throat where it felt tight again. Production barrels are better and better these days, but .0005 or greater differential is most likely still in spec for this particular rifle.
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Old 11-18-2018, 12:28 AM
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Quote:
Originally Posted by kendog4570 View Post
It is also possible you hit a carbon ring at the throat where it felt tight again.
That's my guess and why I asked about the bore being clean/dirty.
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Old 11-23-2018, 4:12 PM
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Could be a ring at the chamber..but I feel it was pretty clean. Regardless - it was pretty tight where the front sight was pressed on. My feeling is the front sight is causing a problem. Anyway - it is heading back to Ruger for them to figure out.
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