Resized 6x47 brass won't chamber

[CacheCropp]

So I have this new barrel installed on my rifle, 6x47 Lapua. I took some once fired 6.5x47 brass and ran it through the Forster 6x47 FL sizer. It won't chamber. I double checked case neck diameter, it was 0.269. Chamber is supposed to be 0.273. I double checked case length. It was 1.844 on avg. max is 1.850.

I took a headspace measurement with my Stoney Point gauge, it came out 1.4865 on several cases, (this measures from bottom up to along the middle of shoulder). I screwed the sizer down a 1/4 turn so my Co-ax press cams on the bottom of the die. Resized cases again. Measured again. I get between 1.4860 and 1.4865. Still won't chamber.

The only other thing I can think of is that there is a small ridge at the base of the neck. Not a doughnut, but a little ridge where the neck transitions to the shoulder. Anyone familiar with this? Could this be the problem? What is the solution?

After trying 10 cases, a few will chamber but I have to really muscle the bolt down to close. The rest won't chamber at all.

 

[ShootDots]

Were those ONCE fired cases fired in that chamber? Or were they fired from another chamber or reamer?

 

[boltfluter]

If you have a new piece of brass, run it through the die. As your brass is once fired I would suspect the brass may be to big on the back end. Just first thing that comes to mind. Keep us posted.

Paul
www.boltfluting.com

 

[CacheCropp]

Were those ONCE fired cases fired in that chamber? Or were they fired from another chamber or reamer?

No. this is a 6x47 chamber. The brass is 6.5x47. I resized the brass in my Forster 6x47 Full Length sizing die. That should make the body, shoulder and neck meet standard SAAMI specs.

 

[jdh47]

It might be too large at the bottom like has been said. If you have another press you can set it up so that it cams over in that press and resize. I am not sure the Forster shell holder allows the die to come down far enough. At least that is the experience I have had with mine on some .223 brass I picked up at the range that had been fired in an AR.

Joe

 

[SG4247]

I had a few that had a slight bulge on new 6.5 brass at the neck at the shoulder junction from the Forster die. The bolt would not close on about 20% of them.

I then measured the wall thickness on necked down brass and it was a really thick - .014". So, I decided to turn the necks to .012" and the problem was gone. Shot the whole season afterwards with no problems.

 

[swd]

Take a black or blue Sharpie and mark the case up pretty good. Run it in hard and use a cleaning rod to tap it out if you need to. See where it's tight. And like a few others said, try new brass. Your chambers may not be interchangable. When they don't fit, more often than not, they are tight towards the back of the case.

 

[ireload2]

Lube one of your sized cases again and size it very slow. Let it sit at the top of the stroke about 4 or 5 seconds.
Retract the case a little from the die and rotate it about 120 degrees and slowly size it again with the 4 second dwell.
Retract, rotate again and size again with the dwell. The dwell gives the brass a little time to creep to the final configuration.
Your comparator can be used before and after to detect movement of the shoulder.

If you still need more sizing use a feeler gage in the shell holder under the case head.
Start with .002 then .003 and so on until the case chambers.

 

[ShootDots]

No. this is a 6x47 chamber. The brass is 6.5x47. I resized the brass in my Forster 6x47 Full Length sizing die. That should make the body, shoulder and neck meet standard SAAMI specs.

There are 2 things at work here: 1.) when you neck down, your neck wall thickness grows>>>possibly too large to enter the chambers' neck area; and 2.) The base of the case, fired in a different chamber, may be too large to enter your new chamber. It is one or both of them..

 

[savagedasher]

Sounds like your chamber is is tight on head space .
Try cutting a sofa can the size of the brass head and resize a brass that is tight . If it the fits go have your die cut short .
Larry

 

[dmoran]

There are 2 things at work here: 1.) when you neck down, your neck wall thickness grows>>>possibly too large to enter the chambers' neck area; and 2.) The base of the case, fired in a different chamber, may be too large to enter your new chamber. It is one or both of them..

+++1

Sounds like your chamber is is tight on head space .
Try cutting a sofa can the size of the brass head and resize a brass that is tight . If it the fits go have your die cut short .
Larry

Interpreter needed..... Thanks

 

[John Russell]

It is most likely that the gun that the cases were originally fired in, had longer headspace than your rifle - that is common.

And FL sizers are NOT all the same size - some are a wee bit longer than others - you may have a very short chamber, and an FL that is 1 or 2 thou longer.

I have had this problem with brass that was given to me. I recently got some Norma once fired .220 Swift cases, from a member on this forum. They are quite tight in my rifles chamber. It is the way I prefer to get fired cases. When I fire them for the first time, they will form to my chamber, without stretching. Then they will chamber without effort.

As Larry said (through an interpreter's translation ), "Try cutting a soDa can the size of the brass head and resize a brass that is tight . If it the fits go have your die cut short ."


Or, you can buy some new brass - size the neck, and shoot it.

 

[gotcha]

I had the same (I think) problem with a Forster 6.5X 47L die. It just wouldn't size enough to set the shoulder back on fired brass. Had my H/S gauge chkd. with an optical comparator and it was good to go. Ended up milling about .004" from the top of my shell holder. When screwed down tight to the shell holder the die now gives me a sweet .0015 to .002" bump. You can mill the shell holder at home a little at a time to achieve the bump you want to get that perfect fit. If you want some tips on milling your own shell holder drop me a PM ,,,,,,,,,,,,,,,, Otherwise good ideas above.

 

[BOB LEE SWAGGER]

Sounds like your chamber is is tight on head space .
Try cutting a sofa can the size of the brass head and resize a brass that is tight . If it the fits go have your die cut short .
Larry

Try weighing your calipers and then use SS media to polish your new primers.

 

[savagedasher]

I had the same (I think) problem with a Forster 6.5X 47L die. It just wouldn't size enough to set the shoulder back on fired brass. Had my H/S gauge chkd. with an optical comparator and it was good to go. Ended up milling about .004" from the top of my shell holder. When screwed down tight to the shell holder the die now gives me a sweet .0015 to .002" bump. You can mill the shell holder at home a little at a time to achieve the bump you want to get that perfect fit. If you want some tips on milling your own shell holder drop me a PM ,,,,,,,,,,,,,,,, Otherwise good ideas above.

His press dont likely have a shell holder . So a shim under the case head should tell him if his dies is too long. A few here don't only wan to give a smart a-- answer rather then help .
Larry

 

[Eddie Harren]

Sounds like your chamber is is tight on head space .
Try cutting a sofa can the size of the brass head and resize a brass that is tight . If it the fits go have your die cut short .
Larry

Better'n the funny papers!

 

[BOB LEE SWAGGER]

His press dont likely have a shell holder . So a shim under the case head should tell him if his dies is too long. A few here don't only wan to give a smart a-- answer rather then help .
Larry

And the opposite of smart ass is ding ding ding what?

 

[Eddie Harren]

His press dont likely have a shell holder . So a shim under the case head should tell him if his dies is too long. A few here don't only wan to give a smart a-- answer rather then help .
Larry

I,for one, hope this man never quits posting on this forum. He is a constant source of levity.

 

[dmoran]

Better'n the funny papers!

And the opposite of smart ass is ding ding ding what?

Guess were missing out, dyslexia dialect is some how more helpful....

 

[gotcha]

His press dont likely have a shell holder . So a shim under the case head should tell him if his dies is too long. A few here don't only wan to give a smart a-- answer rather then help .
Larry

His press dont likely have a shell holder . So a shim under the case head should tell him if his dies is too long. A few here don't only wan to give a smart a-- answer rather then help .
Larry

Smart ass answer? I failed to note he had a Co-ax. My bad. No need to be such a Cretin. I've seen you make a few bad calls but no one called you names. Grow up and get a life.