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Rifles, Reloading, Optics, Equipment
Reloading
Belted Magnum questions for you guys..
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<blockquote data-quote="MagnumManiac" data-source="post: 616810" data-attributes="member: 10755"><p>Unfortunately you have fallen into the trap of FL sizing your brass way too much from the beginning. High pressures are NOT the cause of this case stretching, it is ONLY caused by excessive sizing of the shoulder. SAAMI specs dictated for factory loaded ammo is fine and dandy, but once it's been fired in your chamber it's a completely different kettle of fish. As you've found out, (the hard way!), you must be very careful with how much you bump the shoulder back, .002" is maximum if you want your brass to last more than a few firings.</p><p></p><p>Your brass can be salvaged, run it through your body die with the press camming over, there should be no gap between the shellholder and die bottom when doing this. This will reduce the dimensions just above the belt, no matter what anyone tells you!</p><p>Once this is accomplished, you will need to fireform the brass back to your chamber dimensions with a mild load, a true fireforming load without a projectile would be better, but this will suffice. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>Once you have fireformed the brass, measure the base to shoulder length and adjust your body die to bump the shoulder .002", this will allow the case to headspace off the shoulder. </p><p>If this is done correctly, you will eliminate that bulge forever, it only occurs when the brass stretches just above the belt due to excessive shoulder sizing. Under no circumstances do you want a belted bottleneck cartridge to headspace off the belt, other than the 300H+H, 375H+H, 458WM or 458Lott.</p><p></p><p>BTW, even though there are advocates for the Larry Willis die, I do not believe in it, it's a complete unnecessary gimmick if you size your cases correctly to headspace off the shoulder. I am yet to run across this 'bulge' in any of my belted cartridges and, I load for a hell of a lot of 'em.</p><p></p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 616810, member: 10755"] Unfortunately you have fallen into the trap of FL sizing your brass way too much from the beginning. High pressures are NOT the cause of this case stretching, it is ONLY caused by excessive sizing of the shoulder. SAAMI specs dictated for factory loaded ammo is fine and dandy, but once it's been fired in your chamber it's a completely different kettle of fish. As you've found out, (the hard way!), you must be very careful with how much you bump the shoulder back, .002" is maximum if you want your brass to last more than a few firings. Your brass can be salvaged, run it through your body die with the press camming over, there should be no gap between the shellholder and die bottom when doing this. This will reduce the dimensions just above the belt, no matter what anyone tells you! Once this is accomplished, you will need to fireform the brass back to your chamber dimensions with a mild load, a true fireforming load without a projectile would be better, but this will suffice. :D Once you have fireformed the brass, measure the base to shoulder length and adjust your body die to bump the shoulder .002", this will allow the case to headspace off the shoulder. If this is done correctly, you will eliminate that bulge forever, it only occurs when the brass stretches just above the belt due to excessive shoulder sizing. Under no circumstances do you want a belted bottleneck cartridge to headspace off the belt, other than the 300H+H, 375H+H, 458WM or 458Lott. BTW, even though there are advocates for the Larry Willis die, I do not believe in it, it's a complete unnecessary gimmick if you size your cases correctly to headspace off the shoulder. I am yet to run across this 'bulge' in any of my belted cartridges and, I load for a hell of a lot of 'em. gun) [/QUOTE]
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Belted Magnum questions for you guys..
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