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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair bump gauge error
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<blockquote data-quote="o2bmark" data-source="post: 3015531" data-attributes="member: 6358"><p>I checked setback with hornaday, Sinclair, and by cartridge base to bullet base of bullet sitting on lands and only Sinclair measured .006-7 while other two .002</p><p>I've been loading for more than 50 years and understand headspace. The perfection of the chamber or my Redding dies has not been measured by me but the difference of how far a fired and resized case enters the chamber is what I have measured. I blackened a resized case and pushed it firmly into Sinclair insert. The heavy contact points were where neck meets shoulder (surprise to me) and shoulder meets body (expected). The flat of the shoulder was marked but much lighter indicating that insert was reasonably accurate on mimicking angle. All of this could explain the different measurement but I would only expect by 1 or 2 thousandths not 5. Now that I've examined the blackened case my suspicion is that the neck to shoulder joint is the problem. Redding dies use neck size bushings which are beveled and cannot get but so close to shoulder perhaps leaving enough unsized neck to skew reading. I may bevel the Sinclair insert at neck just to see what happens. It's all just curiosity on my part from this point forward Since I have other ways to measure.</p></blockquote><p></p>
[QUOTE="o2bmark, post: 3015531, member: 6358"] I checked setback with hornaday, Sinclair, and by cartridge base to bullet base of bullet sitting on lands and only Sinclair measured .006-7 while other two .002 I’ve been loading for more than 50 years and understand headspace. The perfection of the chamber or my Redding dies has not been measured by me but the difference of how far a fired and resized case enters the chamber is what I have measured. I blackened a resized case and pushed it firmly into Sinclair insert. The heavy contact points were where neck meets shoulder (surprise to me) and shoulder meets body (expected). The flat of the shoulder was marked but much lighter indicating that insert was reasonably accurate on mimicking angle. All of this could explain the different measurement but I would only expect by 1 or 2 thousandths not 5. Now that I’ve examined the blackened case my suspicion is that the neck to shoulder joint is the problem. Redding dies use neck size bushings which are beveled and cannot get but so close to shoulder perhaps leaving enough unsized neck to skew reading. I may bevel the Sinclair insert at neck just to see what happens. It’s all just curiosity on my part from this point forward Since I have other ways to measure. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair bump gauge error
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