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Rifles, Reloading, Optics, Equipment
Reloading
Reloading the 300WBY mag??
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<blockquote data-quote="RegionRat" data-source="post: 2622356" data-attributes="member: 57231"><p>The issue with 300 Weatherby Magnum is they use a 0.4276 diameter to define the shoulder datum on the ammo.</p><p>There is a 0.4345 diameter that defines the shoulder datum for the chamber. The tool needs to be near those two values and stay off the radius. Once you have one, it doesn't matter as long as you always use the same one as a comparator.</p><p></p><p>The belted magnum is supposedly headspaced on the belt, so that first cycle is based on the belt headspace, and there after as reloaders we tend to want sizing to be limited to reliable feed rather than the original size to make the cases last and to control case volume. So, we then tend to want to go to just enough shoulder bump to close the bolt and feed reliably, but then there are diameters to consider.</p><p></p><p>Brass from a particular chamber needs to be checked for the shoulder datum and diameters after a few cycles to determine how that particular chamber allows the brass to expand. </p><p></p><p>I am sure you know all this but it bears repeating for the beginners.</p><p></p><p>The extra work on the sizing die may or may not be due to the same reasons your friend crushed the case. Sometimes the diameter just above the belt at the 0.250 line is not sized well enough by a normal sizing die. In any case, I would suggest you study the diameters as well as the shoulder datum length. </p><p></p><p>You will want a good micrometer for this task and admittedly this is tricky without what we call a blade mic, but do your best with the round anvil type and see if they look like they are at or over the specs.</p><p></p><p>I would use the drawings below and study ammo that fits in the chamber, fired unsized brass, and sized brass, to see if you can find a reason. It is always a little difficult to know how any given chamber compares to specifications, but this is the way to start the homework.</p><p></p><p>If you size and the case fits the gun, that becomes the gold standard.</p><p></p><p>What part of the case did the die look like it was pushing when it crushed the case? Sometimes it can be seen, sometimes the evidence is destroyed. Sounds like you were able to make it work with a little extra effort. YMMV.</p><p></p><p>[ATTACH=full]395330[/ATTACH]</p></blockquote><p></p>
[QUOTE="RegionRat, post: 2622356, member: 57231"] The issue with 300 Weatherby Magnum is they use a 0.4276 diameter to define the shoulder datum on the ammo. There is a 0.4345 diameter that defines the shoulder datum for the chamber. The tool needs to be near those two values and stay off the radius. Once you have one, it doesn't matter as long as you always use the same one as a comparator. The belted magnum is supposedly headspaced on the belt, so that first cycle is based on the belt headspace, and there after as reloaders we tend to want sizing to be limited to reliable feed rather than the original size to make the cases last and to control case volume. So, we then tend to want to go to just enough shoulder bump to close the bolt and feed reliably, but then there are diameters to consider. Brass from a particular chamber needs to be checked for the shoulder datum and diameters after a few cycles to determine how that particular chamber allows the brass to expand. I am sure you know all this but it bears repeating for the beginners. The extra work on the sizing die may or may not be due to the same reasons your friend crushed the case. Sometimes the diameter just above the belt at the 0.250 line is not sized well enough by a normal sizing die. In any case, I would suggest you study the diameters as well as the shoulder datum length. You will want a good micrometer for this task and admittedly this is tricky without what we call a blade mic, but do your best with the round anvil type and see if they look like they are at or over the specs. I would use the drawings below and study ammo that fits in the chamber, fired unsized brass, and sized brass, to see if you can find a reason. It is always a little difficult to know how any given chamber compares to specifications, but this is the way to start the homework. If you size and the case fits the gun, that becomes the gold standard. What part of the case did the die look like it was pushing when it crushed the case? Sometimes it can be seen, sometimes the evidence is destroyed. Sounds like you were able to make it work with a little extra effort. YMMV. [ATTACH type="full" width="686px"]395330[/ATTACH] [/QUOTE]
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Reloading
Reloading the 300WBY mag??
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