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Rifles, Reloading, Optics, Equipment
Reloading
Run-out help needed
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<blockquote data-quote="Bart B" data-source="post: 738247" data-attributes="member: 5302"><p>Not so in my experience and that of others.</p><p></p><p>I measure bullet best relative to the middle of the case shoulder and 1/10th inch back from the bullet tip with the case pressure ring resting at its back end. That's how the round fits the chamber. Multiple full length sizings with a die whose neck diameter is 2/1000ths smaller than loaded neck diameter on a given case did not change the runout numbers on a 47-shot test with the same case full length sized every time. A friend put 57 shots from a single .308 Win. case so sized into 1/3" at 100 yards in his test with his rifle in a machine rest.</p><p></p><p>Neck bending's always got me better accuracy with military M118 and M852 match as well as commercial match ammo. They've typically got 8 to 14 mils TIR for military and 3 to 8 TIR for commercial, half that for standard runout. Bent hundreds of 'em as they're held in a .338 caliber bullet puller on the case neck, then pushed the case head away from the runout high point. Got 'em back to no more than 6 thousandths TIR. Improves accuracy at 600 yards by 1/2 to 3/4 MOA. Been there, done that; know very well how much it helps.</p></blockquote><p></p>
[QUOTE="Bart B, post: 738247, member: 5302"] Not so in my experience and that of others. I measure bullet best relative to the middle of the case shoulder and 1/10th inch back from the bullet tip with the case pressure ring resting at its back end. That's how the round fits the chamber. Multiple full length sizings with a die whose neck diameter is 2/1000ths smaller than loaded neck diameter on a given case did not change the runout numbers on a 47-shot test with the same case full length sized every time. A friend put 57 shots from a single .308 Win. case so sized into 1/3" at 100 yards in his test with his rifle in a machine rest. Neck bending's always got me better accuracy with military M118 and M852 match as well as commercial match ammo. They've typically got 8 to 14 mils TIR for military and 3 to 8 TIR for commercial, half that for standard runout. Bent hundreds of 'em as they're held in a .338 caliber bullet puller on the case neck, then pushed the case head away from the runout high point. Got 'em back to no more than 6 thousandths TIR. Improves accuracy at 600 yards by 1/2 to 3/4 MOA. Been there, done that; know very well how much it helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Run-out help needed
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