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Why Is My .280 AI so slow?

 
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  #1  
Old 06-12-2012, 07:32 PM
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Join Date: Jun 2012
Location: Northern California
Posts: 46
Why Is My .280 AI so slow?

So I have tried everything. I have a custom .280AI. Have been trying to develop a load for several weeks now. Have tried 11 or 12 powders. Seat depth. the list goes on and on.
Found where the high pressure mark lies with my action. Worked slowly back from there to a tight group. She will shoot clover leaf patterns all day if I dont mind 2,500 fps. 162 gr. A-Max. Tried the Berger bullets. They wouldnt group either.
Whats going on?
Anybody got ideas.
Thanks
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  #2  
Old 06-12-2012, 07:51 PM
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Join Date: Jul 2004
Location: OHIO
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Re: Why Is My .280 AI so slow?

You sure your chronograph is working?

What are all of the components and powder charge that are giving you that velocity?
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  #3  
Old 06-12-2012, 09:30 PM
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Re: Why Is My .280 AI so slow?

Quote:
Originally Posted by Derek M. View Post
You sure your chronograph is working?

What are all of the components and powder charge that are giving you that velocity?
What length of barrel as well as the components? Run your velocity/data and shoot it at say500 yds and see if your 2500 fps is correct. I've seen quite a few of lying chronographs that should have been shot.

Any chance you know someone else with a crony? Set them up back to back and see what you get.
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  #4  
Old 06-12-2012, 10:15 PM
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Join Date: May 2012
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Re: Why Is My .280 AI so slow?

Sounds like your barrel doen't like that bullet weight. I had an '06 once that would only do 2600 fps with a 165, but would do 2900 with a 150 or 2600 with a 200. If you don't have a broken chrono, change your bullet weight as your rifle doesn't like it. Most times it is only accuracy that suffers, but velocity can too. What about primers, have you tried more than one make of primer??
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  #5  
Old 06-12-2012, 10:39 PM
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Join Date: Jan 2011
Location: Pa.
Posts: 103
Re: Why Is My .280 AI so slow?

What powders are you using? My 280AI loved 168 gr Bergers with varget, it would shoot under .2". Right now i'm using 140gr Barnes with again, varget. But it opened up the group size to .35". Still nice for deer at close range with little meat loss.

Are you using a manual powder dispenser or electric?
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  #6  
Old 06-12-2012, 10:41 PM
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Join Date: Jun 2012
Location: Northern California
Posts: 46
Re: Why Is My .280 AI so slow?

I appreciate the following.
I'm shooting a 26" kreiger barrel.
56.5 gr imr 7828 ssc.
162 a max.
I loaded close to max in the book. Backed out a few primers.
Realized my head spacing was wrong. Started fire forming my brass and only neck sizing. Tuned them down about a grain and a half. Still wouldn't group. Turned them down more till I got the clover leaf I was looking for.
The cronigraph data was gathered from 3 different cronographs.
I think the head spacing played part in the high pressure signs. Might try some warmer loads. I'm not sure what to do. If I go to a lighter bullet I will loose bc. Less range.
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  #7  
Old 06-12-2012, 10:57 PM
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Join Date: Jun 2012
Location: Northern California
Posts: 46
Re: Why Is My .280 AI so slow?

I hand trickle each charge.
Calibrate my scale each time before loading.
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