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Having pressure problems with 6mm ackley

 
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  #1  
Old 08-30-2013, 10:52 AM
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Join Date: Apr 2013
Location: Moscow, Idaho
Posts: 62
Having pressure problems with 6mm ackley

I have a 6mm ackley with a 22.5" barrel and am having pressure problems when reaching the max loads listed for a standard 6mm. I am shooting 95 Berger VLD's and have them .003 off the lands. I was wondering if anyone has any ideas why I am having this problem. I have the just enough headspace so the bolt closes with the slightest resistance. I am having primers flatten and slightly crater. I am using IMR 4831 and H 414. With the 414 I have only gone to 45 grains and have pressure problems. Anyone have any suggestions???
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Old 08-30-2013, 02:02 PM
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Join Date: Jul 2010
Location: Bloomfield, Iowa
Posts: 104
Re: Having pressure problems with 6mm ackley

I have had a batch of H414 that had a much faster burn rate than the reloading manual suggested. I loaded a middle of the road charge in the manual for a 220 swift and my velocity was about 250 fps too high and I had to beat open the bolt. I have had other batches of H414 that were dead on what the manual said. Did you chronograph your loads to see if the velocities are what you're expecting?
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  #3  
Old 08-30-2013, 05:29 PM
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Join Date: Apr 2013
Location: Moscow, Idaho
Posts: 62
Re: Having pressure problems with 6mm ackley

I did chrono the loads and that was also disappointing. I was getting 3285 average and a friend was shooting a standard 243 win with the same length barrel and 95 Berger Classic averaging 3300. I have also had the same problem shooting IMR 4831 where the velocities are low and pressures seem high. I'm not getting the extra velocity that I should with the ackley. Thanks for the input
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