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Rifles, Reloading, Optics, Equipment
Reloading
.28 Nosler Pressure
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<blockquote data-quote="tim_w" data-source="post: 1354855" data-attributes="member: 11132"><p>I am a bit lost after reading thru this.</p><p></p><p>Are you guys getting the right vel for a higher powder charge but just do not like the fact that others are using more powder to get the same vel?</p><p></p><p>I get it if you are getting say what the reload manual states is a min charge and the vel that goes with it and are seeing pressure issues but if the vel is where it should be at a higher charge than you use vel as your indicate. As has been said psi is directly related to the pressure curve.</p><p></p><p>I get that the change in one barrel goi g from needing 3 gr more to needing 3 gr less for the same vel lea es a big???</p><p></p><p>My thought are break down what can change.</p><p></p><p>If your cleaning the barrel it will not be the cuase</p><p></p><p>Are you using the same brass?</p><p></p><p>Did you trim all to the same length and check h2o capacity when new and then now you are having issues? If its new brass compare to the old. Maybe your fl sizing is actually taking it down so much below new its costing capacity.</p><p></p><p>Is it the same lot of powder and was it kept in the same stable enviornment the whole time?</p><p></p><p>Bullets crom the same lot? Measured bearing surface diameter and compare?</p><p></p><p>My gut says its the brass.</p><p></p><p>Also after the first firing if you are still having to trim necks each firing or two the brass is being pusbed too hard. Brass only flows when its pushed past the point of it yeild stength by a large margin. </p><p></p><p>I would be getting some new nosler brass. Throw out any extremely short ones then trim the others to the shortest length of the mean group. Weight them and sort. Then test h2o capacity for each group. Load say 3. Fire. Check h20. Resize and check h20 again. Load again and fire. Keep repeating say 3 to 5x.</p><p></p><p>You can also compare to others what their h20 capacity is for a case length. The compare their charge amount for thag specific load and see how it compares.</p><p></p><p>Case marks are one of the worst ways to gauge pressure. If you were perfect with the same brass and firings etc where everythi g could be consistent it could get you ball park maybe. Anyone with pressure testing equipment will tell you the same thing. While strain gauges can be consistent they must be calibrated on each barrel to give absolute pressure but still great. Piezo and referance powder loaded ammo still has to be used to do it right.</p><p></p><p>My bet is case capacity changed. If its not that next would be powder lot burn rate change. Next bullet diameter. </p><p></p><p>I say start with new cases and docume t everything. Keep the lot size small so you are not wasting barrel life and money.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1354855, member: 11132"] I am a bit lost after reading thru this. Are you guys getting the right vel for a higher powder charge but just do not like the fact that others are using more powder to get the same vel? I get it if you are getting say what the reload manual states is a min charge and the vel that goes with it and are seeing pressure issues but if the vel is where it should be at a higher charge than you use vel as your indicate. As has been said psi is directly related to the pressure curve. I get that the change in one barrel goi g from needing 3 gr more to needing 3 gr less for the same vel lea es a big??? My thought are break down what can change. If your cleaning the barrel it will not be the cuase Are you using the same brass? Did you trim all to the same length and check h2o capacity when new and then now you are having issues? If its new brass compare to the old. Maybe your fl sizing is actually taking it down so much below new its costing capacity. Is it the same lot of powder and was it kept in the same stable enviornment the whole time? Bullets crom the same lot? Measured bearing surface diameter and compare? My gut says its the brass. Also after the first firing if you are still having to trim necks each firing or two the brass is being pusbed too hard. Brass only flows when its pushed past the point of it yeild stength by a large margin. I would be getting some new nosler brass. Throw out any extremely short ones then trim the others to the shortest length of the mean group. Weight them and sort. Then test h2o capacity for each group. Load say 3. Fire. Check h20. Resize and check h20 again. Load again and fire. Keep repeating say 3 to 5x. You can also compare to others what their h20 capacity is for a case length. The compare their charge amount for thag specific load and see how it compares. Case marks are one of the worst ways to gauge pressure. If you were perfect with the same brass and firings etc where everythi g could be consistent it could get you ball park maybe. Anyone with pressure testing equipment will tell you the same thing. While strain gauges can be consistent they must be calibrated on each barrel to give absolute pressure but still great. Piezo and referance powder loaded ammo still has to be used to do it right. My bet is case capacity changed. If its not that next would be powder lot burn rate change. Next bullet diameter. I say start with new cases and docume t everything. Keep the lot size small so you are not wasting barrel life and money. [/QUOTE]
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.28 Nosler Pressure
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