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Rifles, Reloading, Optics, Equipment
Reloading
? on cartridge headspace gauges.
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<blockquote data-quote="britz" data-source="post: 357909" data-attributes="member: 7865"><p>With a headspace guage like this your basically measuring the distance from the taper on the shoulder/neck to the base of the cartridge. I believe it is referred to as the datumn line. I believe the 30-06 will work just fine for the 25-06 or any of the 06 family of cartridges. Now, if you take your measurements and information and try to duplicate them w/ a different headspace guage, it won't work. You keep track of your data w/ the specific guage you used to come up w/ the data. </p><p></p><p>What I do is take a few fired cartridges that I feel the bolt lift a little hard on and measure those cases. When I set up my sizing die I will set them to resize the cases a couple thou shorter than what causes a sticky bolt. The idea is to simply push the shoulders of the case back a couple thousandths to ensure proper chambering. No need to push shoulders back much farther than that since it will only cause the case to stretch more than needed and it doesn't help accuracy any either.</p><p></p><p>Hope this helps.</p><p>Mark.</p><p></p><p>also, just reread the last part of your question... Some rifles simply won't handle much over the minimum charge. Seating on the lands will also increase pressure. Certain primers brands will flatten a little easier than others too. But when primers flatten the charge is plenty heavy. I really don't know if a small amount of excessive headspace will cause excessive pressure. I'd look to trying a different powder. Also, depending on what brand powder your using you may want to look at hodgdon's site since they do publish the pressures that their test rifles had w/ the load published. Every rifle behaves a little differently depending on how the chamber was cut and so on but it is a guide.</p><p></p><p>Have you looked at multiple load manuals for your charge inforation? I have found one manual might list the starting load the same as another manual will list the max!</p></blockquote><p></p>
[QUOTE="britz, post: 357909, member: 7865"] With a headspace guage like this your basically measuring the distance from the taper on the shoulder/neck to the base of the cartridge. I believe it is referred to as the datumn line. I believe the 30-06 will work just fine for the 25-06 or any of the 06 family of cartridges. Now, if you take your measurements and information and try to duplicate them w/ a different headspace guage, it won't work. You keep track of your data w/ the specific guage you used to come up w/ the data. What I do is take a few fired cartridges that I feel the bolt lift a little hard on and measure those cases. When I set up my sizing die I will set them to resize the cases a couple thou shorter than what causes a sticky bolt. The idea is to simply push the shoulders of the case back a couple thousandths to ensure proper chambering. No need to push shoulders back much farther than that since it will only cause the case to stretch more than needed and it doesn't help accuracy any either. Hope this helps. Mark. also, just reread the last part of your question... Some rifles simply won't handle much over the minimum charge. Seating on the lands will also increase pressure. Certain primers brands will flatten a little easier than others too. But when primers flatten the charge is plenty heavy. I really don't know if a small amount of excessive headspace will cause excessive pressure. I'd look to trying a different powder. Also, depending on what brand powder your using you may want to look at hodgdon's site since they do publish the pressures that their test rifles had w/ the load published. Every rifle behaves a little differently depending on how the chamber was cut and so on but it is a guide. Have you looked at multiple load manuals for your charge inforation? I have found one manual might list the starting load the same as another manual will list the max! [/QUOTE]
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