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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tight Throat?
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<blockquote data-quote="TwoMore" data-source="post: 1404353" data-attributes="member: 95166"><p>looks like the freebore area is where the scuffing is which is going to be pretty tight (+.0005 over bullet Diameter) .00025 per side. any runout of the bullet and case and it will rub. I usually accept .001 to .002 run-out on loads so even there the free bore will be lining up the bullet heavy on one side. I have a wsm that will leave the same mark as yours but it is always on the right side of the chambered round and when I took out the ejector it quit. a .314 fired neck diameter wont mean that it is a 314 neck chamber, the brass will spring back. my .3164 no turn tight neck chambered wsm's brass usually measures about .315 to just under after firing and .312 loaded(turned brass). I would definitely invest in a concentricity gauge. i was just lookin at my huntin rounds that have been in and out of that chamber all season and they have some rubbing in the same area. i just took some pics. the center round got dropped it looks like and has about .007 runout, I chambered it and put it in the pic. this chamber is .168 fb. none of the rounds are hard to chamber but they are reloads bumped .002. I am not starting a bump or FL sizing whizzing match lol I neck size some too lol but I can see where FL sizing may eliminate hard cambering here and let the free-bore line it up.</p></blockquote><p></p>
[QUOTE="TwoMore, post: 1404353, member: 95166"] looks like the freebore area is where the scuffing is which is going to be pretty tight (+.0005 over bullet Diameter) .00025 per side. any runout of the bullet and case and it will rub. I usually accept .001 to .002 run-out on loads so even there the free bore will be lining up the bullet heavy on one side. I have a wsm that will leave the same mark as yours but it is always on the right side of the chambered round and when I took out the ejector it quit. a .314 fired neck diameter wont mean that it is a 314 neck chamber, the brass will spring back. my .3164 no turn tight neck chambered wsm's brass usually measures about .315 to just under after firing and .312 loaded(turned brass). I would definitely invest in a concentricity gauge. i was just lookin at my huntin rounds that have been in and out of that chamber all season and they have some rubbing in the same area. i just took some pics. the center round got dropped it looks like and has about .007 runout, I chambered it and put it in the pic. this chamber is .168 fb. none of the rounds are hard to chamber but they are reloads bumped .002. I am not starting a bump or FL sizing whizzing match lol I neck size some too lol but I can see where FL sizing may eliminate hard cambering here and let the free-bore line it up. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Tight Throat?
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