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Rifles, Reloading, Optics, Equipment
Reloading
Innovative Technologies Reloading Products?
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<blockquote data-quote="Bart B" data-source="post: 640023" data-attributes="member: 5302"><p>Few folks realize what that microscopic step in front of the belt on H&H style case heads does to degrade accuracy. Getting rid of it in fired belted cases was the norm years ago when 30 caliber magnums ruled the roost for long range matches. Best accuracy then ( and also typical these days ) is with new or proper full length sized cases, that is, if one wants best accuracy for 25 to 30 shots instead of only 5 or so.</p><p></p><p>Back then, smart folks would cut the top and bottom off a standard belted case full length sizing die then use it after regular full length sizing a fired case to get the body diameter immediately in front of the belt back to near new diameters. Best thing about the Innovative collet die is it moves brass only radially and not both radially and lengthwise which the old "body" dies did.</p><p></p><p>If your belted case rifle won't shoot sub 6/10ths MOA at 1000 yards, you may want to get one of these collet dies. Otherwise, stick with new cases; they'll shoot that well very easily.</p><p></p><p>(BTW, case bulging and creating a micro step in front of the belt will happen quite a bit with a belted chamber headspaced at exactly .220". If one knows what new belted case headspace dimensions are for those made within SAAMI specs, they should be able to figure out why this is reality. Note the belt's front edge is typically back a few thousandths from the chamber belt's edge when peak pressure is reached in the barrel. I've worn out four 30 caliber magnum barrels all with headspace set right at SAAMI minimum of .220" and all new cases had that step when first fired.)</p></blockquote><p></p>
[QUOTE="Bart B, post: 640023, member: 5302"] Few folks realize what that microscopic step in front of the belt on H&H style case heads does to degrade accuracy. Getting rid of it in fired belted cases was the norm years ago when 30 caliber magnums ruled the roost for long range matches. Best accuracy then ( and also typical these days ) is with new or proper full length sized cases, that is, if one wants best accuracy for 25 to 30 shots instead of only 5 or so. Back then, smart folks would cut the top and bottom off a standard belted case full length sizing die then use it after regular full length sizing a fired case to get the body diameter immediately in front of the belt back to near new diameters. Best thing about the Innovative collet die is it moves brass only radially and not both radially and lengthwise which the old "body" dies did. If your belted case rifle won't shoot sub 6/10ths MOA at 1000 yards, you may want to get one of these collet dies. Otherwise, stick with new cases; they'll shoot that well very easily. (BTW, case bulging and creating a micro step in front of the belt will happen quite a bit with a belted chamber headspaced at exactly .220". If one knows what new belted case headspace dimensions are for those made within SAAMI specs, they should be able to figure out why this is reality. Note the belt's front edge is typically back a few thousandths from the chamber belt's edge when peak pressure is reached in the barrel. I've worn out four 30 caliber magnum barrels all with headspace set right at SAAMI minimum of .220" and all new cases had that step when first fired.) [/QUOTE]
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Innovative Technologies Reloading Products?
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