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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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<blockquote data-quote="Mike Matteson" data-source="post: 2534886" data-attributes="member: 101791"><p>I find this interesting. I used a 308 Norma Mag for years and do. At the start I use 300 WM case and sized them back to 308 Norma Mag sizing cut the case to length. I was FL sizing for awhile. I have case separation and very early in, using those cases. Generally in three firing the case was done. I change to a 300 WM neck sizing die, and stop the separation at the belt. If look you'll will see that the 308NM case is shorter to the shoulder, than the 300WM case. The neck is shorter with the 300WM case, due to lengthening the case to the shoulder. So my fix was to FL the 300WM case to 308 NM, then fire form them to chamber. There after I used a 300WM neck sizing die to size the neck only. That only sized about half of the neck length. It stopped the case separation in it's tracks. The only problem after that was primer pockets would get to large after about 10 firing. The moral of the story is getting the belted mag case to form to the shoulder quickly as possible. Only bumping back by a .001 or .002 is needed to extend the case life for sure. Just how you get there is another thing. Jammed or pushing the bullet into the lands is one way. Double shoulder is another way. I also several other belted mag's. Rem, Win, and M-98 actions. My son has a browning action, and we haven't gotten that far yet. </p><p>Now I never used the double shoulder to fire form the case. Not totally up on doing that either. I am not with just how to set that up. Being your allowing the neck to be at a different size than what the chamber size is. Seem like there could be and should be some problems there. Getting the bolt to close. I would think that probably need to use a mandrel to expand the neck some then size the neck down a portion to chamber size. That what causing me a lot of concerns. Probable I don't fully understand. I see I am going to get some up coming. So be it. Learning at 74. It's hard to brake an old dog of old habits, but can be trained for new tricks.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2534886, member: 101791"] I find this interesting. I used a 308 Norma Mag for years and do. At the start I use 300 WM case and sized them back to 308 Norma Mag sizing cut the case to length. I was FL sizing for awhile. I have case separation and very early in, using those cases. Generally in three firing the case was done. I change to a 300 WM neck sizing die, and stop the separation at the belt. If look you'll will see that the 308NM case is shorter to the shoulder, than the 300WM case. The neck is shorter with the 300WM case, due to lengthening the case to the shoulder. So my fix was to FL the 300WM case to 308 NM, then fire form them to chamber. There after I used a 300WM neck sizing die to size the neck only. That only sized about half of the neck length. It stopped the case separation in it's tracks. The only problem after that was primer pockets would get to large after about 10 firing. The moral of the story is getting the belted mag case to form to the shoulder quickly as possible. Only bumping back by a .001 or .002 is needed to extend the case life for sure. Just how you get there is another thing. Jammed or pushing the bullet into the lands is one way. Double shoulder is another way. I also several other belted mag's. Rem, Win, and M-98 actions. My son has a browning action, and we haven't gotten that far yet. Now I never used the double shoulder to fire form the case. Not totally up on doing that either. I am not with just how to set that up. Being your allowing the neck to be at a different size than what the chamber size is. Seem like there could be and should be some problems there. Getting the bolt to close. I would think that probably need to use a mandrel to expand the neck some then size the neck down a portion to chamber size. That what causing me a lot of concerns. Probable I don't fully understand. I see I am going to get some up coming. So be it. Learning at 74. It's hard to brake an old dog of old habits, but can be trained for new tricks. [/QUOTE]
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Reloading
Brass Case Head Separation after 6 firings
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