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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet/case neck run out
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<blockquote data-quote="jmden" data-source="post: 36056" data-attributes="member: 1742"><p>Hi and thanks for your replies Ladyhawk, Mikecr and Roper.</p><p></p><p>Ladyhawk: I'm using standard Redding dies in a 7/8-14 press. I the decapping/expander rod is floating via an 0-ring and my shellholder (Redding comp shellholder let me give a .002 shoulder setback)floats as well. Any other ideas to bring the system into better concentricity? This is factory rifle and I have lapped the bolt lugs using Brownells tool that does this aligning with the receiver thread, and I've also lapped the barrel/receiver joint for a good fit and bedded, adjust trigger, fully floated barrel, etc. Scope rings (Leupold Mark 4), lapped, etc. etc... However, as you mention, I'm not sure how good my chamber is as when I check runout after firing about 1/2 the case necks are right about at .001 and then other 1/2 are from .0015 to .002 or so. I thought that maybe I'm getting some "spring back" due to hard brass, etc. so I've been anealing every 2-3 firings and I still seem to get the same caseneck runout numbers after firing. Hmmm...not sure what to do next here. The rifle is shooting sub .5MOA most of the time and sometimes much better than that. But I get a flier ever 6-7 shots that I'd sure like to keep from happening.</p><p></p><p>It seems like that I have good cocentricity (less than .001 until I seat the bullet). Again, I've got the standard Redding bullet seater. What could be changed/done to improve the concentricity to this operation?</p><p></p><p>Mikecr: I'm not using bushing dies...yet. Perhaps this would help concentricity? Although your reply seemed to indicated going away from busing dies...to arbor presses? Can you size 300 UM brass with an arbor press?</p><p></p><p>Roper, could you link me to the post by FiftyDriver you're talking about? What do you mean by this exactly: "Mikecr is right your round is more concentric to the dies and press if using a standard set of dies and press." </p><p></p><p>Thanks all,</p><p></p><p>Jon Denham</p></blockquote><p></p>
[QUOTE="jmden, post: 36056, member: 1742"] Hi and thanks for your replies Ladyhawk, Mikecr and Roper. Ladyhawk: I'm using standard Redding dies in a 7/8-14 press. I the decapping/expander rod is floating via an 0-ring and my shellholder (Redding comp shellholder let me give a .002 shoulder setback)floats as well. Any other ideas to bring the system into better concentricity? This is factory rifle and I have lapped the bolt lugs using Brownells tool that does this aligning with the receiver thread, and I've also lapped the barrel/receiver joint for a good fit and bedded, adjust trigger, fully floated barrel, etc. Scope rings (Leupold Mark 4), lapped, etc. etc... However, as you mention, I'm not sure how good my chamber is as when I check runout after firing about 1/2 the case necks are right about at .001 and then other 1/2 are from .0015 to .002 or so. I thought that maybe I'm getting some "spring back" due to hard brass, etc. so I've been anealing every 2-3 firings and I still seem to get the same caseneck runout numbers after firing. Hmmm...not sure what to do next here. The rifle is shooting sub .5MOA most of the time and sometimes much better than that. But I get a flier ever 6-7 shots that I'd sure like to keep from happening. It seems like that I have good cocentricity (less than .001 until I seat the bullet). Again, I've got the standard Redding bullet seater. What could be changed/done to improve the concentricity to this operation? Mikecr: I'm not using bushing dies...yet. Perhaps this would help concentricity? Although your reply seemed to indicated going away from busing dies...to arbor presses? Can you size 300 UM brass with an arbor press? Roper, could you link me to the post by FiftyDriver you're talking about? What do you mean by this exactly: "Mikecr is right your round is more concentric to the dies and press if using a standard set of dies and press." Thanks all, Jon Denham [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
bullet/case neck run out
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