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Rifles, Reloading, Optics, Equipment
Reloading
Best method to measure headspace?
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<blockquote data-quote="QuietTexan" data-source="post: 2992705" data-attributes="member: 116181"><p>One potential issue there is the LE Wilson gauge does NOT measure body diameter. It's cut large to be able to measure headspace using their mic tool, and to check case length, of <u>fired</u> brass.</p><p></p><p>Eventually body demensions need to be sized also, and dropping into an LE Wilson is no guarantee of chamber fitment at the case head.</p><p></p><p>Sheridan Engineerings makes true min-spec case gauges to check sized ammo with:</p><p>[URL unfurl="true"]https://sheridanengineering.com/product/243-win-ammunition-gauge/[/URL]</p><p></p><p>Hornady Cartridge Gague and Whidden Case Gauge are SAAMI spec minimum, but Whidden checks headpsace off the belt for 7RM. SAC makes the best comparator set available right now IMO to take measurements, Whidden is my second choice.</p><p></p><p>PMA makes a little printed measuing tool that tries to get a repeatable measurement on th e.200 datum line. it uses calipers so it's not the most precise tool available, but it's good enough to check new/FL sized brass versus fired brass to see how much sizing you're getting at the back end of the case.</p><p>[URL unfurl="true"]https://www.pmatool.com/200-line-measuring-tool-kit/[/URL]</p><p></p><p></p><p>Yes, I use bolt drop on rifles to set maximum headspace usually. It's an easy way that's separate from taking measurements and the risks of tolerance stacking. It either goes or it doesn't, no theoretical at all. I have just about every measuring tool available, and I use them to record data, but the set point of the die is based on the real chamber. Same thing with trim length of the brass.</p><p></p><p>I normally don't have the ejector installed at all until brass is fully formed and stabilized, I'll also pull the entire ingition group from the bolt to get the drop. Easy enough if you buy a couple of simple tools:</p><p>[URL unfurl="true"]https://www.brownells.com/tools-cleaning/gun-tools/rifle-tools/remington-700-bolt-maintenance-tool-kit/[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2992705, member: 116181"] One potential issue there is the LE Wilson gauge does NOT measure body diameter. It's cut large to be able to measure headspace using their mic tool, and to check case length, of [U]fired[/U] brass. Eventually body demensions need to be sized also, and dropping into an LE Wilson is no guarantee of chamber fitment at the case head. Sheridan Engineerings makes true min-spec case gauges to check sized ammo with: [URL unfurl="true"]https://sheridanengineering.com/product/243-win-ammunition-gauge/[/URL] Hornady Cartridge Gague and Whidden Case Gauge are SAAMI spec minimum, but Whidden checks headpsace off the belt for 7RM. SAC makes the best comparator set available right now IMO to take measurements, Whidden is my second choice. PMA makes a little printed measuing tool that tries to get a repeatable measurement on th e.200 datum line. it uses calipers so it's not the most precise tool available, but it's good enough to check new/FL sized brass versus fired brass to see how much sizing you're getting at the back end of the case. [URL unfurl="true"]https://www.pmatool.com/200-line-measuring-tool-kit/[/URL] Yes, I use bolt drop on rifles to set maximum headspace usually. It's an easy way that's separate from taking measurements and the risks of tolerance stacking. It either goes or it doesn't, no theoretical at all. I have just about every measuring tool available, and I use them to record data, but the set point of the die is based on the real chamber. Same thing with trim length of the brass. I normally don't have the ejector installed at all until brass is fully formed and stabilized, I'll also pull the entire ingition group from the bolt to get the drop. Easy enough if you buy a couple of simple tools: [URL unfurl="true"]https://www.brownells.com/tools-cleaning/gun-tools/rifle-tools/remington-700-bolt-maintenance-tool-kit/[/URL] [/QUOTE]
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Best method to measure headspace?
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