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.243 blown primers

 
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  #8  
Old 04-02-2012, 08:40 AM
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Re: .243 blown primers

Quote:
Originally Posted by rscott5028 View Post
Surely the scale has been calibrated and cross checked....

Excellent point!!
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  #9  
Old 04-02-2012, 09:48 AM
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Re: .243 blown primers

i use 37.5 grain of varget with an 85. is ar2209 the same as varget?. no matter you are using too much powder.
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  #10  
Old 04-04-2012, 06:42 AM
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Re: .243 blown primers

Yeah we compared his scale with mine, and they show identicle readings. The primer pocket has expanded and primers sit loosley. The strange bit is he tried this exact loading in the past and there was no signs of high pressure.
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  #11  
Old 04-04-2012, 08:22 AM
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Re: .243 blown primers

Well for what ever reason ( hot powder lot?) it is a very over pressure load. Maybe it was close before and a new powder lot pushed it over the edge. I would not shoot one more. Back it off and start over working up slowly is my advice.

Jeff
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Old 04-04-2012, 10:55 AM
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Re: .243 blown primers

I would seariously consider using a different powder or a different bullet. I have no experience with that powder brand. However, I have had a similar experience using Hodgdon's loading data and a 22-250 switching to a 60 grain pill. I used a medium load to start with since I had maxed out the powder with no problem and a 55 grain bullet. First shot blew my primer out, stretched the case. Idiot me didn't realize that the case had blown out yet so I had shot an additional 2 rounds with the same result. I didn't realize until the 3rd shot actually blew the ejector plug back in the bolt face of my Savage rifle.

moril is that the charts arent always right for every rifle/bullet/powder combo.

and yes, i did pull my head out of my rear since then. ;)
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  #13  
Old 04-04-2012, 04:19 PM
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Re: .243 blown primers

AR2209 is H4350
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  #14  
Old 04-05-2012, 07:55 PM
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Re: .243 blown primers

How many times has he reloaded the brass??? The 243 is famous for case stretching even after the first reload. Do the rounds chamber hard/tight?? If so it could be the neck is too long and he is jamming the bullet into the throat which is pinching the neck/bullet and creating extra pressure.

Simple case trimming could fix this or he could rechamber to 243 AI that essentially eliminates case lengthening issue in the 243.

Barstooler
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