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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm-08 Go Gauge for 7mm-08AI?
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<blockquote data-quote="shortgrass" data-source="post: 2829631" data-attributes="member: 24284"><p>Seems like only the new age guys and hobbyists need an Ackley Improved "GO" gage. Using the "GO" for the 'parent cartridge' as the "NO-GO", and then double checking with a virgin piece of brass (of the parent cartridge) to verify 'crush' is all I've needed for the past 31yrs. In this thread I have read .004-.005, .004-.006, and as much as .010 less than "GO" gage of the parent cartridge. 004-.006 as P.O.Ackley said is plenty, and makes up for variations in cartridge case manufacture. The goal is to have the cartridge case supported between the bolt face and the neck/shoulder junction of the chamber. .001 crush would be enough, as the support at the bolt face and neck/shoulder junction is present. That is all that's required, support for fireforming so the case stretches at the front end, and NOT at the head end. I'm in the camp that says more than .001 or .002 because of possible variation in brass. I am a gunsmith school graduate (Montgomery Community College class of '93) and that was what we were taught. The reamer/gage makers hadn't caught on that they could make more money selling a gage that hadn't been needed since Ackley came up with his Improved line of chamberings. Insert the 7mm/08 "GO", and if the bolt handle starts down its path to "closed", remove the gage and insert a virgin piece of 7mm/08 brass and feel the crush. Strip the bolt of its firing pin assembly and plunger ejector (if it has one) before any gaging. Slip the brass/gage under the extractor so it won't give a false 'feel'.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 2829631, member: 24284"] Seems like only the new age guys and hobbyists need an Ackley Improved "GO" gage. Using the "GO" for the 'parent cartridge' as the "NO-GO", and then double checking with a virgin piece of brass (of the parent cartridge) to verify 'crush' is all I've needed for the past 31yrs. In this thread I have read .004-.005, .004-.006, and as much as .010 less than "GO" gage of the parent cartridge. 004-.006 as P.O.Ackley said is plenty, and makes up for variations in cartridge case manufacture. The goal is to have the cartridge case supported between the bolt face and the neck/shoulder junction of the chamber. .001 crush would be enough, as the support at the bolt face and neck/shoulder junction is present. That is all that's required, support for fireforming so the case stretches at the front end, and NOT at the head end. I'm in the camp that says more than .001 or .002 because of possible variation in brass. I am a gunsmith school graduate (Montgomery Community College class of '93) and that was what we were taught. The reamer/gage makers hadn't caught on that they could make more money selling a gage that hadn't been needed since Ackley came up with his Improved line of chamberings. Insert the 7mm/08 "GO", and if the bolt handle starts down its path to "closed", remove the gage and insert a virgin piece of 7mm/08 brass and feel the crush. Strip the bolt of its firing pin assembly and plunger ejector (if it has one) before any gaging. Slip the brass/gage under the extractor so it won't give a false 'feel'. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm-08 Go Gauge for 7mm-08AI?
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