6ppc chambering issues

S

stevenorlando

Guest
Hello All!

I fireformed my 220 Russian cases today. The gun shot very well, but none of the rounds would go into the chamber smoothly. It took some force to successfully close the bolt. However, that same round, when extracted and rechambered, went into the chamber easily.

I took one of those rounds unshot and measured it, and it was about 2.1XX. Is that too long a round?

All the steps to prep the cases for fireforming was done.

Steve
 
Did you run the cases through a 6 PPC full length size die before trying to chamber them? When you do that, it establishes the neck shoulder junction and will let you close the bolt more easily.
 
"""It took some force to successfully close the bolt. However, that same round, when extracted and rechambered, went into the chamber easily."""


Steve, this is typical with >crush fit< fire formed brass to chamber... Afterwords, they go easily...
Just keep your bolt luggs lubed >reguarly< when fire forming...

Now how tight is tight... Sometimes ones chamber can be juuuust a hair shorter on a new barrel OR the Lapua brass can be juuuuust a tad longer than your used too... Actually, the "top" of the shoulder angle is the "problem" from the parent 220 Russian cases... You'll see the difference in a case ran through a PPC FL die and cases not lightly bumped... Read below..

What I do bef fire forming new PPC fully prepped brass is take a good amount of brass and run'em through the action.
Shoud be tight but not > really forcing< tight..If "tight".. Simply, run them through your FL die (will not need your bushing if a bushing die) with a very light bump... This will typically be with the die off the shell holder by around 1/4 - 1/2 turn off.
It's a feel thing... I do this so I still get a good crush fit but not be too hard on the locking surfaces..

Works great for me... Brass comes out beautifully and last forever........

Thoughts for next time fireform prepped PPC brass,
cale
 
Another problem I noticed

Hello All,

While trying to figure out the bullet seating depth I noticed another problem with this fire-formed brass.

The bullet wouldn't go in "below" the shoulder, like there was an internal doughnut, or a large burr. I can hit the bullet with a mallet, and it would go through, but it would still get stuck when I tried to insert it in through the neck. I can take a 1/4" drill bit and at slow speed drill through, but I'd rather not do that.

I never had this problem before with my factory 6ppc. What happened!!!!!!
 
With at least a .030 free bore, you should not have the bullet heal right at the shoulder neck junction...
Now a Zero freebore chamber and 68gr 7 ogive bullet.....

"""I think my neck-turning mandrel should take care of it."""

K&M mandrel with a doughnut cutter on the end...?

cale
 
Last edited by a moderator:
caroby said:
With at least a .030 free bore, you should not have the bullet heal right at the shoulder neck junction...
Now a Zero freebore chamber and 68gr 7 ogive bullet.....

"""I think my neck-turning mandrel should take care of it."""

K&M mandrel with a doughnut cutter on the end...?

cale
Click to expand...

Hello Cale,

I tried it and it didn't work. I have a mandrel on my neck turner with the flutes. Is that what you're talking about?

If not, what are you talking about and where do I get it?

Steve
 
Just out of curiosity, what bullet are you using? None that I use come that low in the neck, with a thirty thousandths longer freebore.
 
Even in the event that you had no freebore, I can't see the need to pound bullets thru the neck with a mallet. As to using
a 1/4 " drill bit to open up the donut, I think you will need some band-aids
 
Steve,

The Barts, even the "original" has a short bearing surface and long point.... Sounds like IF you are seating the bullet ANYWHERE near the shoulder/neck junction, your chamber freebore is or is next to Zero....


IF... You have no choise but to seat the bullet heal in the doughnut / neck-shoulder area.... Depending on the brand of neck turning equipment you use, you may be able to get a custom made mandrel with doughnut cutter on the end.

Myself... IMOP.
I use a .050 and .060 freebore PTG reamers for my 6PPC chambers... No matter what bullet.. I have never needed to cut out the doughnuts.. Even a 6 ogive 68gr bullet with A LOT of bearing surface, the heal is .005 - .010 off the neck shoulder area... The typical bullet I make and shoot is a strait 8 ogive off a .790 jacket... Got gobbs of room behind the bullet in the neck BUT plenty in the neck for concentricity and tension...... Ohhhh and lottsa POWDER..!

So.. 1. What's your free bore.? ... Don't own the reamer....? Can ya call the smith.?
2. What brand of neck turning tool.?

cale
 
Well, I decided to ignore the donut. I was told by some (even on this forum) that it won't affect anything.

Steve
 
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