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Subject Topic: TIght Neck Shaving Bullet 5.56/223 Post ReplyPost New Topic
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landtoy80
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Posted: January 26 2013 at 9:50pm | IP Logged Quote landtoy80

My pre sized, trimmed and primed 5.56 military brass has very tight necks. They shave a brass ring off the factory/commercial FBFMJ bullets. Not a problem with when I use SS109 bullets. I will be reloading factory BTFMJ bullets now in the tight neck cases. What can I do to keep from scraping bullet?
Was thinking of just running the sizer in the neck just enough to flare the mouth a bit. Then use the Lee Factory Crimp to finish the load.

Edited by landtoy80 on January 26 2013 at 9:52pm


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Paul5388
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Posted: January 26 2013 at 10:11pm | IP Logged Quote Paul5388

Have you reamed to inside of the mouth after you trimmed? Sometimes there will still be some material left from the trimming operation, plus the mouth being beveled will help seat flat based bullets just about any time.

Edited by Paul5388 on January 26 2013 at 10:13pm


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landtoy80
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Posted: January 26 2013 at 10:24pm | IP Logged Quote landtoy80

I didn't do anything to the cases. It was all done at the place that processes used cases.
I will try chamfering to see that helps first.

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Posted: January 27 2013 at 12:19am | IP Logged Quote NRA Instructor

Years ago l had perhaps the same problem. When
crimping the cartridge a small almost hair thin
ring of jacket material was being clipped from the
bottom edge of the bullet's crimping groove. That

was because the bullet was not deep enough into
the case before the crimp was started. Adjusting
the seating depth down a little solved the
problem.



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joed
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Posted: January 27 2013 at 5:18am | IP Logged Quote joed

You didn't say if you were crimping the bullets.   If you are then I'm going with what NRA Instructor posted. And that is also why I do not crimp and seat in the same step.

Edited by joed on January 27 2013 at 7:01am
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Emrah
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Posted: January 28 2013 at 11:43am | IP Logged Quote Emrah

+1 on chamfering the case mouths. I had this problem occasionally with .223 loading as well. A slight chamfer is all you need. One quick turn by hand and you're done.

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Posted: January 28 2013 at 12:57pm | IP Logged Quote The_Shadow

I am with joed on this issue, bullets without a cannelure groove and even tight fitting bullets can scrap off some bullet jacket material during the seating process.

Seating bullets to depth without any crimp being applied (crimping is squeezing the case against the jacket or into the cannelure) should help this issue.

Crimping in a seperate step assures that the bullet is not moving as the casing neck is being squeezed inward.

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landtoy80
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Posted: January 28 2013 at 3:35pm | IP Logged Quote landtoy80

No Crimp when seating. It was when the taper of the boat tail got to the max width of the bullet, that is where tiny gold looking right comes from.

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TexIndian
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Posted: January 28 2013 at 8:00pm | IP Logged Quote TexIndian

I've found that most any brand of standard sizing die leaves a neck that is much smaller than necessary. I've bought several brands of new brass and have found that 100% of this brass also has an under-sized neck. I think that safety is the reason behind this. It prevents a rank newbie from making rifle loads that can be dangerous because the neck tension is too light (bullet setback, unfired bullets lodging in bore, etc).

But the problem the OP describes is one of the negative results small necks can cause. Excessive work-hardening and reduced case life is another result of this problem - the case necks get shrunk down too much and then stretched back out with every cycle.

One cure is to switch to the S-type sizing dies that let you control the amount of 'shrinking' done to the neck. But with brass that is already sized like the OP's or with new brass, here is what I use: Sinclair makes expander mandrels for less than $10 that are either .002 or .003 smaller than the bullet diameter. After a little spring-back, these will leave your necks with plenty of tension even for a semi-auto rifle, but no so tight as to shave your bullets. These mandrels are held in a die made just for this purpose (less than $27 right now). The die will hold any of the standard sized mandrels. This method also lets you make sure the necks of new brass are perfectly round and centered.

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Slick
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Posted: January 28 2013 at 8:35pm | IP Logged Quote Slick

I buy those $2 carbide reamers from Harbor Freight and put the reamer in a miniature battery-powered screw gun. These turn slow, so it's just a matter of touching the mouth of each shell briefly on the spinning reamer to knock off the sharp edge. It works great and takes only a little time to zip through 100 shells or so.

http://www.harborfreight.com/1-2-half-inch-six-flute-counter sink-93342.html

I forgot to mention that this is now the same tool I use to remove primer crimps.

Edited by Slick on January 28 2013 at 8:36pm


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Posted: January 28 2013 at 9:31pm | IP Logged Quote NRA Instructor

landtoy80 wrote:
No Crimp when seating. It
was when the taper of the boat tail got to the max
width of the bullet, that is where tiny gold looking
right comes from.

O.k. given this info it almost certainly is from
inside of case neck not being chamfered.

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landtoy80
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Posted: January 29 2013 at 6:57pm | IP Logged Quote landtoy80

I called the company when I got it several years ago and they said they set up the machine that sizes the case to have a tight neck. They are a commercial brass manufacture. When using surplus SS109 no scraping, its just with commercial bullets.

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landtoy80
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Posted: February 03 2013 at 5:35pm | IP Logged Quote landtoy80

NRA Instructor wrote:
landtoy80 wrote:
No Crimp when seating. It
was when the taper of the boat tail got to the max
width of the bullet, that is where tiny gold looking
right comes from.

O.k. given this info it almost certainly is from
inside of case neck not being chamfered.


Yes it was lack of chamfer. I loaded a Sierra BT and it when in hard and made a gold ring from scraping. I chamfered one it went in easy and no scraping. The outfits commercial resizing machine either doesn't chamfer or was not set up right.

Now that I sold all my SS109 bullets I am going to have to chamfer the bag of 5.56 cases.

Edited by landtoy80 on February 03 2013 at 5:41pm


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farmall
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Posted: February 05 2013 at 8:42am | IP Logged Quote farmall

I really like my Lyman VLD chamfer tool for this. Had the same issue you were having before I started using it.
Andy

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