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Old-Win
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Lead Peeling Back
Jan 31st, 2016 at 6:54pm
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I thought if I started the topic with another breech seating problem, nobody would look! Grin
I just got back my new highwall project with a .321" bore and started playing with my seater and seating depth.  Both bullets that I tried are tapered and is I pushed the bullets back out, I noticed that lead has peeled back as the bullet gets closer to the base band. (.323")  Is this normal as the bullet seals up the bore? Would these shavings go out the bore with the powder blast?  Thanks
  
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frnkeore
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Re: Lead Peeling Back
Reply #1 - Jan 31st, 2016 at 7:48pm
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It could be normal, depending on how much lead that your "pushing back". That extra .002 of lead, has to go somewhere.

What are the diameters of the last 3 bands and how long is the base band? How did you set the BS depth?

A picture would help, a lot.

Frank
  
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calledflyer
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Re: Lead Peeling Back
Reply #2 - Jan 31st, 2016 at 8:39pm
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One of my seaters peels back lead, too. In this case it's due to the inner plug  being a bit too small. The plug on the other is two thou bigger and it doesn't peel anything back. Just a thought- measure the plug- it ought to be very close to the base size in my understanding.
  
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calledflyer
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Re: Lead Peeling Back
Reply #3 - Jan 31st, 2016 at 9:13pm
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I meant to say in the earlier post that the small one doesn't hurt the thing as far as leaving lead in the bore- but it doesn't always cup the base concentrically, and the accuracy of the slugs is off. Basically causes an imbalanced slug. It came with the rifle, and may have been used on a smaller diameter bullet than I use. I don't use it now that I have a better fitting one.
  
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shovel80
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Re: Lead Peeling Back
Reply #4 - Jan 31st, 2016 at 10:21pm
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calledflyer wrote on Jan 31st, 2016 at 8:39pm:
One of my seaters peels back lead, too. In this case it's due to the inner plug  being a bit too small. The plug on the other is two thou bigger and it doesn't peel anything back. Just a thought- measure the plug- it ought to be very close to the base size in my understanding.


Interesting that a .002 difference in diameter would case a problem.......

Terry
  
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John Boy
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Re: Lead Peeling Back
Reply #5 - Jan 31st, 2016 at 10:28pm
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If I understand the post - at the base of the bullet there is a thin layer of lead that has been shaved off the base.  If yes - the seater plug has a smaller diameter than the bullet base.
Here is a remedy: buy 5/16" self adhesive felt pads from Duro-Felt ... (You need to Login or Register to view media files and links)
Stick them on your bullets so the seater plug doesn't bugger the bases when seating the bullet...
(You need to Login or Register to view media files and links)
  
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calledflyer
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Re: Lead Peeling Back
Reply #6 - Jan 31st, 2016 at 11:18pm
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Good catch, two hundredths- not two thou. I should have watched what I wrote. Point is that the bigger one (that fits best on the bullet) is better. 
I don't suppose .002 would have been noticed as an improvement.
  
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Old-Win
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Re: Lead Peeling Back
Reply #7 - Feb 1st, 2016 at 9:45am
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Here's a picture to show what the base band looks like.   
  
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frnkeore
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Re: Lead Peeling Back
Reply #8 - Feb 1st, 2016 at 1:17pm
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The throating doesn't look right. It actually doesn't look like there is any throat at all. The lands should be cut at 20 1/2 degrees and yours look like it's close to 90 degres.

Do you know who did the chamber?

Frank
  
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Old-Win
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Re: Lead Peeling Back
Reply #9 - Feb 1st, 2016 at 2:21pm
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Steve Baldwin with a JGS reamer.
  
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beltfed
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Re: Lead Peeling Back
Reply #10 - Feb 1st, 2016 at 2:21pm
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Also note that those rifling grooves in the bullet look awful deep. Is the Bore Diameter smaller on this barrel?
beltfed/arnie
  
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Re: Lead Peeling Back
Reply #11 - Feb 1st, 2016 at 2:26pm
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Bullet is to big. You guys and your fat bullets.  Needs throated or use a not so fat bullet. If it shoots good leave it alone. Might give you trouble in hot weather.

Try sizing the base of the bullet. 

          Joe.
  
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frnkeore
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Re: Lead Peeling Back
Reply #12 - Feb 1st, 2016 at 2:35pm
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I like the design of the bullet, do you know who made it? I'd say the grooves are very shallow, since the lands go to the bottom of the groves or, at least extremely close.

I would send the picture of your bullet to Steve and ask his opinion on the throating. If he says it's fine, I'd send it to someone else to re-throat.

If it is a newer Douglas barrel, the lands will be deeper (.004/.0045) and the groove, no larger than .320.

Frank

  
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Re: Lead Peeling Back
Reply #13 - Feb 1st, 2016 at 2:39pm
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Hey, I REALLY, REALLY don't know what I'm talking about but is it possible the chamber is too short and the case is being pushed over the bullet base?  O.K., it was stupid, I'll go back to my corner. Lips Sealed
  
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Re: Lead Peeling Back
Reply #14 - Feb 1st, 2016 at 2:42pm
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Grin
  
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