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<blockquote data-quote="Trickymissfit" data-source="post: 573501" data-attributes="member: 25383"><p>an interesting experiment I did many years back just occured to me, and may have some merit in this converstion.</p><p> </p><p>I was shooting two 6mm Remingtons that seemed to have chamber that were almost identical. The barrels has similar twists, but one was a sporter and the other was a bull barrel. Even the lengths were the same.</p><p> On both rifles I was plagued with fliers that almost always impacted between the ten oclock and 12 oclock position. I'd shoot four shots and the next one would be a flier (not always in that order). I was loading at the range, and only using five rounds. (the answer was obvious, but just didn't register. I had weighed the cases, and made them as identical as I could. Then I marked the case that shot a flier with a felt tip pen. Sure enough the next flier was that case. Got another case out of the box and loaded it, and the group was right there. Went home an measured all six cases to see how many grains of water they held. The marked case was slightly less in capacity than the others; yet weighed within the 5/10th window. </p><p> Next trip to the range, I brought my chronograph to do some work with a .223. I also brought the two 6mm rifles, and for the heck of it I shot them thru the chronograph. Had forgotten about the odd ball case, and when fired it was a little faster than the others. Not a whole lot but still a little bit. I remembered getting a shot every now and then that was out of the window I was using for my velocity. I then started keeping track of .223 cases that acted funny, and it was the same damned case almost everytime! I started culling them, and my groups got better and better</p><p> </p><p>Of course there are no bells or whistles to let me know something's wrong with a round going thru the screens, and you just have to do a little thinking. I now set aside any round that seems odd in performance, and then check the case out when I have time</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 573501, member: 25383"] an interesting experiment I did many years back just occured to me, and may have some merit in this converstion. I was shooting two 6mm Remingtons that seemed to have chamber that were almost identical. The barrels has similar twists, but one was a sporter and the other was a bull barrel. Even the lengths were the same. On both rifles I was plagued with fliers that almost always impacted between the ten oclock and 12 oclock position. I'd shoot four shots and the next one would be a flier (not always in that order). I was loading at the range, and only using five rounds. (the answer was obvious, but just didn't register. I had weighed the cases, and made them as identical as I could. Then I marked the case that shot a flier with a felt tip pen. Sure enough the next flier was that case. Got another case out of the box and loaded it, and the group was right there. Went home an measured all six cases to see how many grains of water they held. The marked case was slightly less in capacity than the others; yet weighed within the 5/10th window. Next trip to the range, I brought my chronograph to do some work with a .223. I also brought the two 6mm rifles, and for the heck of it I shot them thru the chronograph. Had forgotten about the odd ball case, and when fired it was a little faster than the others. Not a whole lot but still a little bit. I remembered getting a shot every now and then that was out of the window I was using for my velocity. I then started keeping track of .223 cases that acted funny, and it was the same damned case almost everytime! I started culling them, and my groups got better and better Of course there are no bells or whistles to let me know something's wrong with a round going thru the screens, and you just have to do a little thinking. I now set aside any round that seems odd in performance, and then check the case out when I have time gary [/QUOTE]
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