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Post by cpct on May 20, 2015 4:56:18 GMT -8
I just got my A30 put together last night. I formed three pieces of Hornady brass and made a dummy round. Here's my issue......I sized the brass, trim to 1.615, seat a Barnes 130 TSX to 2.30 per chamber measurement, and chamber the dummy load. It will eject with no issue. I chamber the round again, and it won't eject...even after two more attempts. This happen with the other two formed cases with no seated bullet....same symptoms. The dummy cartridge falls out of the chamber when I tilt the rifle upward.....it's not getting stuck in any way. The bolt head has perfect range of motion in the bolt carrier..no binding. I tried two different bolt carriers with the same bolt. Same issue. Ejector plunger fully depresses..no binding.
Why do you think this happens? It is new, unfired Hornady brass, Daniel Defense 6.8spc bolt, and yes, I did set the die using the gauge that came with the barrel. The dummy round chambers perfectly and when it does eject, there are no indications of a problem (deformed bullet, deformed brass, or case scratches). I'm baffled (and a little pissed off). I'm getting this rifle ready for a very expensive pig hunt in two weeks, and the cases won't eject!!!!!
My thoughts:
Bolt face depth not right for that Hornady brass causing the ejector to not grab the case rim.
Issue with the ejector, itself.
I really need constructive thoughts to remedy this VERY soon. Thanks
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Deleted
Deleted Member
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Post by Deleted on May 20, 2015 5:36:52 GMT -8
Sent you a PM
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Post by madcat on May 20, 2015 8:31:10 GMT -8
If im reading this right and the ejector is in good order I would say the case is going to far in the chamber. Make sure your not moving the case shoulder.
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Post by GLSHOOTER on May 20, 2015 9:06:27 GMT -8
Too short or too tall on the shoulder. The gauge gets you in the neigborhood. These wildcats are not plug and play. Tolerance stacking will cause issues.
Take those case and turn it in 1/8 turn and try them. Make three more that are 1/8th turn taller. What does your Hornady 350 head space gauge say?
Give Ritch a call in the and he can talk you through it if needed.
Greg
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Post by cpct on May 20, 2015 12:07:34 GMT -8
Thank you!! Rich is calling me later. You answered two of my suspicious culprits.
I wish I could post a comparative picture of the brass.
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Post by GLSHOOTER on May 20, 2015 12:54:44 GMT -8
Thank you!! Rich is calling me later. You answered two of my suspicious culprits. I wish I could post a comparative picture of the brass. What are you using to measure with? Greg
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Post by geepee3 on May 20, 2015 13:53:30 GMT -8
Sounds like the same problem I was having. What is happening is with some manufacture new brass the shoulder will not pull up enough. That, in combination with a projectile that will not hit the lands at magazine length. Secant ogive. The "Dummy" cartridge is sitting in front of the bolt face/extractor. If you have bullets that will touch the lands within magazine length that will help. You will need to form the cases with bullets that reach the lands first and headspace the cases properly after firing. Then you can load them with Barnes and other projectiles with a secant ogive.
Glenn
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Post by GLSHOOTER on May 20, 2015 15:37:15 GMT -8
I have never seen a shoulder pull up. Necks expand out and shoulders are lightly touched but they aren't being stretched upwards as far as I can see. Less shoulder bump is better than more generally.
If you want to waste bullets fire forming use any of the 110 FMJ's. The Hornady hits at 2.080 IIRC.
Greg
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Post by geepee3 on May 20, 2015 17:21:16 GMT -8
This is the projectile/combo in question. In my rifles chamber, the C.O.A.L. of this combo would have to 2.404" to touch the lands. The cartridge above does the same as the O.P.'s in my barrel. If you put it in the chamber and close the bolt behind it the extractor will not pick it up. As to shoulder bump. SSA brass run though my Hornady 30 Herrett die will change the datum contact point from 1.343"-1.344" to 1.349"-1.350> measured with the Hornady 350 bush/headspace gauge. This brass when cut to 1.620" and inserted into my chamber will extract when the bolt is closed on it. New Federal, Remington both keep the same datum point 1.343"-1.344" when run through the Hornady die. And cut to 1.620" and chambered will not extract without a projectile that contacts the lands to direct the case into the bolt. My solution was to run new cases with bullets that contact the lands and set the projectiles .003-.005" off the lands and load at 7.62X39mm data. So far It has worked out for me. Hope this helps. Glenn
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Post by GLSHOOTER on May 20, 2015 17:58:43 GMT -8
Is that the 130 TSX? Have you got some numbers on the 125 Pro Hunter? What is your fired measurement on the shoulder? I size fired cases to 1.350. A new formed FC will run the same. A fired case runs 1.355 in my chamber. I have no issues with Remington or Hornady. What happens when you go up to 1.350? I just made up a new SSA at 1.343. Extracted fine.
What are you sizing too on fired cases?
Greg
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Post by geepee3 on May 20, 2015 18:59:07 GMT -8
Yes the picture I posted was that of the Barnes 30 cal. 130 gr. TSX bullet the O.P. was talking about.
Fired cases with the 6.8 Daniel Defense bolt range between 1.3575"-1.360". measured with a Hornady 350 bushing/headspace gauge. My once fire formed A-30 cases are resized to 1.353" and they cycle fine. I have yet to purchase the Sierra 30 cal. 125 gr. Pro hunter bullets so I cannot give you a reference on that. The projectiles I have shot so far are Nosler 30 cal. 110 gr. varmageddon, Nosler 30 cal. 125 gr. Ballistic tipped(in fire formed cases because these have a secant ogive.) and Lapua 30 cal. 123 gr. FMJ bullets. Both the Nosler 110 gr. and lapua 123 gr. will contact the lands within magazine length.
Glenn
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Post by madcat on May 20, 2015 19:13:45 GMT -8
Curious what that line is across the shoulder. I have that on my cases but its above the shoulder at the base of the neck
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Post by geepee3 on May 20, 2015 19:52:24 GMT -8
The line on the shoulder is the mark left from the 350 Hornady bushing. I rotate the brass to get the case to settled in with the caliper.
SSA brass run through the 30 Herrett die leaves a line above the shoulder because of how the shoulder is formed.
Glenn
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Post by GLSHOOTER on May 21, 2015 6:33:36 GMT -8
Ogive has nothing to do with the cases working. They don't care what you stuff in them. The bullet shape is controlling that huge COL you are seeing and since you are stuck with them you just have to put up. What was your COL on the Nosler 110's and 125's? Our measured Nosler 125 was 2.450 on the rifling. My 150 PH's were 2.324 shot at 2.290. The 125's were 2.258 shot at 2.250. If you are jamming monolithic bullets in the lands you are probably raising pressures a great deal. They must be backed off the lands.
Your numbers are very close to mine. I've not had any extraction or function issues in well north of 200 cases made up and used in various flavors.
Greg
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Post by mosigdude on May 21, 2015 10:04:58 GMT -8
Is there a case spec diagram anywhere for the AM30? I believe I understand how to form the brass but trying to get a visual on what we're doing to the parent case as it is formed up
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