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Rifles, Reloading, Optics, Equipment
Reloading
Question on sizing belted mag brass
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<blockquote data-quote="CogburnR" data-source="post: 812126" data-attributes="member: 29174"><p>If the resized cases fit ok in the chamber and are not too long there shouldn't be an extraction problem.</p><p></p><p>Different dies resize the cases differently, my Lee dies will push the shoulder back .020"+ which results in cases head separations in 3-5 loadings. I set the die now to push the shoulder back a .002-.003"</p><p></p><p>None of the regular dies will resize the area directly above the belt very much, a small base die resizes that area more. A body die or the Innovative collet die will size that area back to close to factory dimensions. </p><p></p><p>In my rifle the cases fit easily in the chamber after resizing in the Innovative die(which only resizes the lower case body). Before polishing the chamber the cases fit easily but after firing showed bright spots directly above the belt. After polishing the cases no longer show the bright spots and extract easily. The dimensions of the cases fired in the chamber before and after polishing are virtually the same. </p><p></p><p></p><p>I resized a case then turned the belt off of it in a lathe, then drilled and tapped the base for 1/4nc and mounted it on a piece of threaded rod. I applied a small amount of valve grinding paste to the area directly above the (now gone) belt, lubed the shoulder area and spun the modified case in the chamber for a short time. I then cleaned out the grit and repeated with some FLitz(JB bore bright or jewelers rouge might be better).</p><p></p><p>There may be better ways to polish the chamber but the theory is that cutting off the belt ensures there is no change in headspace(belted cases were intended to headspace from the belt). The valve grinding compound may be a little rough but it ensured the job would get done in a short time in a limited area( the longer the case is spun in the chamber the more other areas are affected). </p><p></p><p>My rifle is a 1990's Winchester Laredo 300WM. It worked pretty well for a long time but developed sticky extraction sometime during the time one of my Buddies owned it. I was going to either fix the problem or re-barrel it. I may sometime re-barrel it anyway but I use it now for practice and it functions fine with pretty hot loads. This rifle seems to only shoot decent groups when loaded towards the top of the pressure curve and not too great even then(slightly sub moa with 180BT's and a 75.5g RL22).</p></blockquote><p></p>
[QUOTE="CogburnR, post: 812126, member: 29174"] If the resized cases fit ok in the chamber and are not too long there shouldn't be an extraction problem. Different dies resize the cases differently, my Lee dies will push the shoulder back .020"+ which results in cases head separations in 3-5 loadings. I set the die now to push the shoulder back a .002-.003" None of the regular dies will resize the area directly above the belt very much, a small base die resizes that area more. A body die or the Innovative collet die will size that area back to close to factory dimensions. In my rifle the cases fit easily in the chamber after resizing in the Innovative die(which only resizes the lower case body). Before polishing the chamber the cases fit easily but after firing showed bright spots directly above the belt. After polishing the cases no longer show the bright spots and extract easily. The dimensions of the cases fired in the chamber before and after polishing are virtually the same. I resized a case then turned the belt off of it in a lathe, then drilled and tapped the base for 1/4nc and mounted it on a piece of threaded rod. I applied a small amount of valve grinding paste to the area directly above the (now gone) belt, lubed the shoulder area and spun the modified case in the chamber for a short time. I then cleaned out the grit and repeated with some FLitz(JB bore bright or jewelers rouge might be better). There may be better ways to polish the chamber but the theory is that cutting off the belt ensures there is no change in headspace(belted cases were intended to headspace from the belt). The valve grinding compound may be a little rough but it ensured the job would get done in a short time in a limited area( the longer the case is spun in the chamber the more other areas are affected). My rifle is a 1990's Winchester Laredo 300WM. It worked pretty well for a long time but developed sticky extraction sometime during the time one of my Buddies owned it. I was going to either fix the problem or re-barrel it. I may sometime re-barrel it anyway but I use it now for practice and it functions fine with pretty hot loads. This rifle seems to only shoot decent groups when loaded towards the top of the pressure curve and not too great even then(slightly sub moa with 180BT's and a 75.5g RL22). [/QUOTE]
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Question on sizing belted mag brass
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