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<blockquote data-quote="daniel1daniel2" data-source="post: 2050417" data-attributes="member: 24434"><p>The reason people say tumbling cases after loading can cause higher pressures is that it often will start to crumble the powder if tumbled for very long which will cause it to burn faster therefore causing pressures to rise. To go a little more in depth think of a log that you are going to burn lets say that it will burn for 1 hour, for simplicity sake, if you split it in half that half will burn in 30 min so you get the same amount of heat produced in 30 min that was produced in a hour. Now lets split it again and again and again now you have 8 smaller pieces that will burn even faster and produce the same amount of heat. It is all a surface area to volume ratio, the more surface area compared to volume the faster it will burn. It should not matter if you don't do it for long, I like Old Fart wipe them off. </p><p></p><p>As for leaving powder in the hopper, I don't just because mine does not seal and the lid comes off very easy.</p><p></p><p>For rifle when I want it to be very accurate I will weigh every charge and add or subtract as needed. That also depends on what you call accurate my .223 is down in the 0.31 center to center and will open up to about 0.58 when i just dump the powder. My 300 win mag will open up to just under a inch from 0.48 outside to outside when weighed. Then again I am using a well used RCBS that is older than me, by several years. It also matters with what type of powder you are using a small ball powder (ex BL-C2) will weigh more consistent than a large extruded powder (ex H1000) (yes I do know those are on opposite ends of the spectrum for rifle powders) </p><p></p><p>I use a Lee trimmer again older than me that still works good, which is probably not much help</p></blockquote><p></p>
[QUOTE="daniel1daniel2, post: 2050417, member: 24434"] The reason people say tumbling cases after loading can cause higher pressures is that it often will start to crumble the powder if tumbled for very long which will cause it to burn faster therefore causing pressures to rise. To go a little more in depth think of a log that you are going to burn lets say that it will burn for 1 hour, for simplicity sake, if you split it in half that half will burn in 30 min so you get the same amount of heat produced in 30 min that was produced in a hour. Now lets split it again and again and again now you have 8 smaller pieces that will burn even faster and produce the same amount of heat. It is all a surface area to volume ratio, the more surface area compared to volume the faster it will burn. It should not matter if you don't do it for long, I like Old Fart wipe them off. As for leaving powder in the hopper, I don't just because mine does not seal and the lid comes off very easy. For rifle when I want it to be very accurate I will weigh every charge and add or subtract as needed. That also depends on what you call accurate my .223 is down in the 0.31 center to center and will open up to about 0.58 when i just dump the powder. My 300 win mag will open up to just under a inch from 0.48 outside to outside when weighed. Then again I am using a well used RCBS that is older than me, by several years. It also matters with what type of powder you are using a small ball powder (ex BL-C2) will weigh more consistent than a large extruded powder (ex H1000) (yes I do know those are on opposite ends of the spectrum for rifle powders) I use a Lee trimmer again older than me that still works good, which is probably not much help [/QUOTE]
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