question on 6BR brass

[Ed333]

I have been using a manual decapping punch, with small pin, to deprime my 6BR casings so that I can get the primer pockets clean when I put the casings in the ultrasonic cleaner. I am using 30.1 grains of Varget behind a 105 gr Hornady A-Max bullet, with CCI 450 primers. This is my third reloading (newbie to F class) on this Lapua brass, and I noticed a couple of things in decapping these twice-fired casings. One, the necks (exterior) are very dirty with carbon, more than I remember from the first firing. Second, the inside diameter of the necks seems to have increased as compared with the first firing. I say this because after the first firing, the depriming punch was a very snug fit into the neck, and after punching out the spent primer, I usually had to use a pair of pliers to pull the pin/punch back out of the flashhole/casing. I can understand that the flashhole might be enlarged a bit after two firings/decappings, but not sure why the neck inside diameter would have changed. I can easily pull the decapping punch out on this round of decapping, and can rattle the punch inside the case neck.
Any thing I should be concerned about?
thanks, Ed

 

[Eddie Harren]

Donut?

 

[dansig]

the necks on my lapua brass was always really dirty after every firing in my 6mm BR, then I rechambered the barrel in 6mmBR tightneck and the case necks come out really clean, you might want to turn your case necks, just a little bit to get them even, that might solve the neck problem.

the primer problem I've never seen, the primers always pop out without any problems, I use Redding competition dies, just take the bushing out of the nk size to decap before ultrasonic.

 

[jonbearman]

I believe redding makes an undersized primer punch as an rcbs is slightly big and will get stuck on alot of cases.The pins I had with my new redding die had a small step on them and they miked smaller. If you are sooting the exterior of your caase necks,that sounds like a low charge situation as it isnt sealing the breach properly.I use h322 and it is near max and I get almost nothing on my no turn necks. The cci450's may be alittle mild.I would try another primer.I use remington small benchrest primers and have had good luck.

 

[Taildrag15X]

What jon said or like I've seen in a friends not enough neck tension and the pressure doesn't build to push it to seal.

 

[Ed333]

..<snip>....If you are sooting the exterior of your caase necks,that sounds like a low charge situation as it isnt sealing the breach properly.

But the neck diameter has apparently increased, since the decapping punch is loose fitting in the neck, where before it was snug...???

<snip>...The cci450's may be alittle mild.I would try another primer.I use remington small benchrest primers and have had good luck.

I thought the CCI 450s were the magnum primer, hotter than the 400s. Would the 4BR's be a better choice?
thanks, Ed

 

[dansig]

I use the CCI BR4 with great result

 

[wapiti25]

Measure the decapping pin you are using. You may be enlarging the Laupa flash hole. Laupa uses a flash hole that is about .060- .061 so you need a smaller than the US std small pin. I use a .059 dia pin for Laupa brass. If you have opened the flash hole you can keep shooting it but don't mix it with other brass. The carbon on your case necks could be because they are getting harder with each firing. Somtimes going up in the charge will reduce the carbon. More neck tension can increase the pressure before bullet release and reduce carbon. I hope this helps.