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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Del-Ton AR-15 question
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<blockquote data-quote="Kevin Thomas" data-source="post: 712300" data-attributes="member: 15748"><p>No problem at all, and I think the Precision Mic will help here. You might also look at teh bump gages that Sinclair and a couple others sell as well. Both of these gages will measure the same thing; the actual length from case head to datum line, which is where we determine our headspace dimension. All of the measurements you've listed here (with the exception of the OAL) appear to be diameter readings, and I don't think that's your problem. The Precision Mic or bump gages will allow you to verify that you are in fact pushing the shoulder back far enough to allow the cartridge to fully enter the chamber, and the bolt to close without binding anything. It also enures that the case is entering the die far enough to take the radial measurments down to where they should be. One other thing; make sure you run these slowly when you resize. Running the case all the way to the cam point (where the press toggles over), <u>hold</u> <u>it</u> <u>there</u>, at least to a count of five. Brass is naturally resiliant and has a spring back factor, which is precisely what makes it the material best suited to making cases. However, that same resilliancy allows it to spring back out a bit if it's simply run into a die for a moment and then pulled right back out. All the way to the top of the stroke, a count of five, and then lower the ram. It makes a difference. </p><p> </p><p>I'm curious as to why the OAL is so short, though? Nominal specs for a 5.56 or 223 Rem is going to be right around 2.260". I generally run mine at 2.250" to 2.255" just to allow a little clearance with the front of the mag. What bullets are you using, and how did you arrive at the 2.220"-2.227" dimension?</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 712300, member: 15748"] No problem at all, and I think the Precision Mic will help here. You might also look at teh bump gages that Sinclair and a couple others sell as well. Both of these gages will measure the same thing; the actual length from case head to datum line, which is where we determine our headspace dimension. All of the measurements you've listed here (with the exception of the OAL) appear to be diameter readings, and I don't think that's your problem. The Precision Mic or bump gages will allow you to verify that you are in fact pushing the shoulder back far enough to allow the cartridge to fully enter the chamber, and the bolt to close without binding anything. It also enures that the case is entering the die far enough to take the radial measurments down to where they should be. One other thing; make sure you run these slowly when you resize. Running the case all the way to the cam point (where the press toggles over), [U]hold[/U] [U]it[/U] [U]there[/U], at least to a count of five. Brass is naturally resiliant and has a spring back factor, which is precisely what makes it the material best suited to making cases. However, that same resilliancy allows it to spring back out a bit if it's simply run into a die for a moment and then pulled right back out. All the way to the top of the stroke, a count of five, and then lower the ram. It makes a difference. I'm curious as to why the OAL is so short, though? Nominal specs for a 5.56 or 223 Rem is going to be right around 2.260". I generally run mine at 2.250" to 2.255" just to allow a little clearance with the front of the mag. What bullets are you using, and how did you arrive at the 2.220"-2.227" dimension? [/QUOTE]
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AR15/10 Rifles
Del-Ton AR-15 question
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