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Rifles, Reloading, Optics, Equipment
Reloading
? for Kirby and other reloading guru's
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<blockquote data-quote="Fiftydriver" data-source="post: 149450" data-attributes="member: 10"><p><strong>Re: ? for Kirby and other reloading guru\'s</strong></p><p></p><p>James, </p><p></p><p>My rule of thumb is to make sure there is at least 0.0005" clearance between your bullet and neck when the round is fired. THat means 1/2 thou all around the bullet so your loaded neck diameters will be roughly 0.001" smaller then your fired case rounds.</p><p></p><p>A bit more comfortable is 3/4 thou all around the bullet and if your throat is quality you can even get by with 1 thou clearance.</p><p></p><p>I do not like anything much looser then this if your turning necks as it kind of defeats the purpose and often will result in your necks getting pretty thin and you have to then watch for neck splits more often and correct with annealing.</p><p></p><p>Simply put, if your loaded ammo neck diameter is 1 to 2 thou smaller then fired neck diameter, you are in the right ball park.</p><p></p><p>Keep in mind however that you need to measure this with relatively new cases. Best would be with freshly formed cases as the more a case is fired, the more it will heat temper and the result will be it will simply get spring. It will expand under pressure but then spring back smaller then chamber neck diameter so your measurements on that case will not give you a true idea of what your real fit it. Use fresh cases to get things set up and then your good to go once all is set up properly.</p><p></p><p>One other aspect to keep in mind is the base diameter of your chamber. If it is built to a standard 0.470" diameter, in most cases, this is quite a bit larger then modern 06 case head diameters are running and it will allow slightly more case head expansion then a properly fitted chamber. This is a common problem because for some reason most brass makers seem to think the 06 based rounds have a case head of a round 0.465" instead of the listed 0.470" correct diameter that most reamers are built to unless specified otherwise.</p><p></p><p></p><p>Try seating off the lands as well a bit. THis will also incease your pressure spike.</p><p></p><p>I would be suprised if RL-22 and H-4831 will not give you the best velocity to pressure ratio. Others to look at would be H-4350 and Rl-19. I would not use powders much slower then Rl-22 unless your using the real heavy bullets. For anything under 140 grains, Rl-22 will get you in most cases the most velocity performance. H-4831 will be nearly identical to that as well.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 149450, member: 10"] [b]Re: ? for Kirby and other reloading guru\'s[/b] James, My rule of thumb is to make sure there is at least 0.0005" clearance between your bullet and neck when the round is fired. THat means 1/2 thou all around the bullet so your loaded neck diameters will be roughly 0.001" smaller then your fired case rounds. A bit more comfortable is 3/4 thou all around the bullet and if your throat is quality you can even get by with 1 thou clearance. I do not like anything much looser then this if your turning necks as it kind of defeats the purpose and often will result in your necks getting pretty thin and you have to then watch for neck splits more often and correct with annealing. Simply put, if your loaded ammo neck diameter is 1 to 2 thou smaller then fired neck diameter, you are in the right ball park. Keep in mind however that you need to measure this with relatively new cases. Best would be with freshly formed cases as the more a case is fired, the more it will heat temper and the result will be it will simply get spring. It will expand under pressure but then spring back smaller then chamber neck diameter so your measurements on that case will not give you a true idea of what your real fit it. Use fresh cases to get things set up and then your good to go once all is set up properly. One other aspect to keep in mind is the base diameter of your chamber. If it is built to a standard 0.470" diameter, in most cases, this is quite a bit larger then modern 06 case head diameters are running and it will allow slightly more case head expansion then a properly fitted chamber. This is a common problem because for some reason most brass makers seem to think the 06 based rounds have a case head of a round 0.465" instead of the listed 0.470" correct diameter that most reamers are built to unless specified otherwise. Try seating off the lands as well a bit. THis will also incease your pressure spike. I would be suprised if RL-22 and H-4831 will not give you the best velocity to pressure ratio. Others to look at would be H-4350 and Rl-19. I would not use powders much slower then Rl-22 unless your using the real heavy bullets. For anything under 140 grains, Rl-22 will get you in most cases the most velocity performance. H-4831 will be nearly identical to that as well. Kirby Allen(50) [/QUOTE]
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