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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
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<blockquote data-quote="goodgrouper" data-source="post: 111551" data-attributes="member: 2852"><p>[ QUOTE ]</p><p> On the dark bullet hole thing, you may be onto something but also consider that the 300 gr SMK has nearly the same meplat as most 22 and 6mm caliber match bullets. Only difference there is a whole lot more bullet diameter so there will be similiar initial paper tear from the meplat but much more paper stretching around the larger diameter bullet resulting in more paper to bullet contact. I suspect this is the reason for the larger black areas on the target more then anything. </p><p></p><p>[/ QUOTE ] </p><p></p><p>Actually, bullet diameter has nothing to do with it at all. /ubbthreads/images/graemlins/shocked.gif I thought so too until I spent a day last year at a 100-200 yard NBRSA match helping score groups. I learned from a guy who has measured tens of thousands of targets that he could tell what powder each shooter was using by the amount, thickness, and color of the "ring" around the hole. He could tell when somebody was shooting 8208 a little mild, or when n133 was screaming, or when Scot was dialed in. I was then informed that some of the guys actually tailor their loads to "cheat the ring" so their groups look smaller! This was the case with the 22 ppcs and the .20 waldog variants too.</p><p></p><p>So for the last year, I have been monitoring this phenomenon in my own shooting and by golly, it works!</p><p></p><p>Some powders reverse the hot/cold thing so you have to know which ones do that or you could go the opposite direction with it.</p><p></p><p>Very interesting stuff.</p><p></p><p>I showed a picture of these holes to my scorer buddy today and he said that he had no experience judging H50bmg but that it looked too mild or shot in cool weather! On the other hand, it could be that H50bmg is one of those reverse powders and shows opposite traits. Sheesh, just when you think you've got things figured out, somebody tells you some new trick! /ubbthreads/images/graemlins/crazy.gif</p><p></p><p></p><p>And you never know, Retumbo might just give a more gradual pressure curve down after a sharp peak and surprise you! I thought for sure that RL25 was going to be the powder of choice in my 338 thunder with the 250 grainers and it shocked me when RL22 was better in every regard across the board! Thanks to 7mmrhb for "forcing" me to just give RL22 a try with the 250's! I figured it would be the powder for the 225's and it worked for both! /ubbthreads/images/graemlins/cool.gif</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 111551, member: 2852"] [ QUOTE ] On the dark bullet hole thing, you may be onto something but also consider that the 300 gr SMK has nearly the same meplat as most 22 and 6mm caliber match bullets. Only difference there is a whole lot more bullet diameter so there will be similiar initial paper tear from the meplat but much more paper stretching around the larger diameter bullet resulting in more paper to bullet contact. I suspect this is the reason for the larger black areas on the target more then anything. [/ QUOTE ] Actually, bullet diameter has nothing to do with it at all. [img]/ubbthreads/images/graemlins/shocked.gif[/img] I thought so too until I spent a day last year at a 100-200 yard NBRSA match helping score groups. I learned from a guy who has measured tens of thousands of targets that he could tell what powder each shooter was using by the amount, thickness, and color of the "ring" around the hole. He could tell when somebody was shooting 8208 a little mild, or when n133 was screaming, or when Scot was dialed in. I was then informed that some of the guys actually tailor their loads to "cheat the ring" so their groups look smaller! This was the case with the 22 ppcs and the .20 waldog variants too. So for the last year, I have been monitoring this phenomenon in my own shooting and by golly, it works! Some powders reverse the hot/cold thing so you have to know which ones do that or you could go the opposite direction with it. Very interesting stuff. I showed a picture of these holes to my scorer buddy today and he said that he had no experience judging H50bmg but that it looked too mild or shot in cool weather! On the other hand, it could be that H50bmg is one of those reverse powders and shows opposite traits. Sheesh, just when you think you've got things figured out, somebody tells you some new trick! [img]/ubbthreads/images/graemlins/crazy.gif[/img] And you never know, Retumbo might just give a more gradual pressure curve down after a sharp peak and surprise you! I thought for sure that RL25 was going to be the powder of choice in my 338 thunder with the 250 grainers and it shocked me when RL22 was better in every regard across the board! Thanks to 7mmrhb for "forcing" me to just give RL22 a try with the 250's! I figured it would be the powder for the 225's and it worked for both! [img]/ubbthreads/images/graemlins/cool.gif[/img] [/QUOTE]
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Testing two rifles, identical chambers ...different barrels
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