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Rifles, Reloading, Optics, Equipment
Reloading
Need some help, very confused, trying to load some hammer hunters
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<blockquote data-quote="rcoody" data-source="post: 1571554" data-attributes="member: 91090"><p>300 win mag factory ammo is designed to headspace off the belt. we as handloaders want to change that to headspacing off the shoulder to avoid case head separation. lots of case body growth with belted magnums. the only part of the measurement you took with the stoney that is accurate on a fired case is from the shoulder to the bullet ogive. i would bet the base to shoulder datum on your threaded case and a fired case are much different.</p><p></p><p>you really need a set of hornady headspace gauges. they are quite inexpensive.</p><p></p><p>you say some of your fired brass chambers easily and some chambers tight. this is where you need the headspace gauges to compare your brass measurements. simple enough to take one of your tight fitting cases (this sgould be a fully fireformed case) and bump the shoulder slightly where it will chamber but without measuring how much did you actually bump it? what base to shoulder datum measurement do you want to use in the future?</p><p></p><p>now if a 1 to 2 thousandth bump to the shoulder case doesn't chamber easily it is time to measure the difference between a new case, fired case and sized case diameter of case body just above the belt. this can be a problem area to size. special dies are made for this but lets hope we don't need to go there.</p></blockquote><p></p>
[QUOTE="rcoody, post: 1571554, member: 91090"] 300 win mag factory ammo is designed to headspace off the belt. we as handloaders want to change that to headspacing off the shoulder to avoid case head separation. lots of case body growth with belted magnums. the only part of the measurement you took with the stoney that is accurate on a fired case is from the shoulder to the bullet ogive. i would bet the base to shoulder datum on your threaded case and a fired case are much different. you really need a set of hornady headspace gauges. they are quite inexpensive. you say some of your fired brass chambers easily and some chambers tight. this is where you need the headspace gauges to compare your brass measurements. simple enough to take one of your tight fitting cases (this sgould be a fully fireformed case) and bump the shoulder slightly where it will chamber but without measuring how much did you actually bump it? what base to shoulder datum measurement do you want to use in the future? now if a 1 to 2 thousandth bump to the shoulder case doesn't chamber easily it is time to measure the difference between a new case, fired case and sized case diameter of case body just above the belt. this can be a problem area to size. special dies are made for this but lets hope we don't need to go there. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Need some help, very confused, trying to load some hammer hunters
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