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Rifles, Reloading, Optics, Equipment
Reloading
Testing Cases After Resizing?
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<blockquote data-quote="slikmrc" data-source="post: 2148938" data-attributes="member: 116436"><p>Belted cases headspace off the belt on initial firing, it is not uncommon for a belted case shoulder to be .020 or more short of contacting the rifle chamber. This is heck of a lot more forming that needs to happen vs say a 6BR. And if you size belted cases by setting the die to contact the shell holder you have a good chance of seeing casehead separation at around 4 to 5 firings. Measure some of your new rounds with the .420 head space comparator vs your fired cases and sized cases to get an idea of your chamber size. One firing may not be fully sizing your brass, so don't keep sizing brass for shoulder bump. Take 4-5 cases and size till the neck is sized and will chamber in your rifle. Fire them and repeat, you will know they are sized to your chamber when you feel resistance when closing the bolt. Then you can set your die to proper shoulder bump. The case body-shoulder junction measurement you reference is not used set shoulder bump. The .420 gauge will shoulder roughly half way up the shoulder, this will measure shoulder bump.</p></blockquote><p></p>
[QUOTE="slikmrc, post: 2148938, member: 116436"] Belted cases headspace off the belt on initial firing, it is not uncommon for a belted case shoulder to be .020 or more short of contacting the rifle chamber. This is heck of a lot more forming that needs to happen vs say a 6BR. And if you size belted cases by setting the die to contact the shell holder you have a good chance of seeing casehead separation at around 4 to 5 firings. Measure some of your new rounds with the .420 head space comparator vs your fired cases and sized cases to get an idea of your chamber size. One firing may not be fully sizing your brass, so don't keep sizing brass for shoulder bump. Take 4-5 cases and size till the neck is sized and will chamber in your rifle. Fire them and repeat, you will know they are sized to your chamber when you feel resistance when closing the bolt. Then you can set your die to proper shoulder bump. The case body-shoulder junction measurement you reference is not used set shoulder bump. The .420 gauge will shoulder roughly half way up the shoulder, this will measure shoulder bump. [/QUOTE]
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Testing Cases After Resizing?
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