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I think I killed my .243

 
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  #1  
Old 02-22-2013, 04:48 PM
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I think I killed my .243

The other day, I loaded up a few rounds for my .243 Winchester, and tried out some new powder- Winchester 760. I loaded up some 95 gr Nosler Ballistic Tips over 41 grains of 760. The Lee Reloading Manual lists a maximum charge of 42 grains, so I figured 41 would be just fine.
This rifle usually shoots under MOA, but with this load, it put my first two shots very close together, then the rest shot around 2 MOA. Weird.
Once I finished shooting, I grabbed my brass off the ground and noticed that one of the shells was very black and had a small hole in the case head. It was just touching the edge of the primer. Further inspection revealed a matching dent in the .243's bolt face.
I checked and double-checked, and my powder charge was, indeed, set at 41 grains.

All subsequent groups from this gun have been 1.5- 2 MOA, and showed erratic tendencies, or stringing.

Anyone have any advice, or is my beloved .243 now a wallhanger?
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Old 02-22-2013, 05:12 PM
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Re: I think I killed my .243

Take it to a smith and pray for mercy.
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Old 02-22-2013, 05:23 PM
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Re: I think I killed my .243

You blew a weak spot in the primer or primer pocket. The result was flame cutting of your bolt face.
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Old 02-22-2013, 05:55 PM
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Re: I think I killed my .243

Quote:
Originally Posted by el si View Post
You blew a weak spot in the primer or primer pocket. The result was flame cutting of your bolt face.
So, are you saying it was possibly an issue with the brass or primer?
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Old 02-22-2013, 06:32 PM
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Re: I think I killed my .243

OOPS! Always start at the lower end of the powder charges. Never that close to the top. Every gun is not alike. Your max may be lower than than the gun the manufacture used to develope the info in the book.
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Old 02-22-2013, 06:59 PM
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Re: I think I killed my .243

I know, I'm a dumbass. I have already tried loads with Varget and Benchmark (starting at the bottom, and working up slowly), and at least 7 different bullets. Every time, I could not get any accuracy until I was near maximum, so I ASSumed I'd be safe with a grain below max, as I had never had any signs of excess pressure before.
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Old 02-22-2013, 07:09 PM
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Re: I think I killed my .243

If a gun can throw them out to 2moa they can throw them into one hole every once in a while=2 shots dont make an accurate load!
As long as the primer just flame cut the bolt and nuthing is sticking up you are where you were(did I spell that right?)
W760 and H414 have been great powders for me over the years but they tend to be a lot temp sensitive and prone to spikeing at the top end. In your case I'll bet it was just a weak spot in the brass/primer though. The Lee manual must have some age to it as 41grains of W760 is about 3 grains more than I would start with? I use W760 and H414 for 55 grain BT loads but use a slower powder(Hunter,R22,Retumbo or Magnum) for the 95-105s
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