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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair Expander Mandrel Die Test
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<blockquote data-quote="Jud96" data-source="post: 1826185" data-attributes="member: 69478"><p>My feelings aren't hurt lol. My point of the test was to see if there was any difference between the two methods of sizing the necks. I have seen many comments and posts in the past claiming mandrel sizing reduced runout and how bad a button is for runout. So this was the purpose of my test. As shown, neither sizing method was significantly better than the other. I hear more about seating dies and bullet seating technique causing runout way more than I do about sizing and chambers causing it. Seating in my opinion causes the most runout, that's when the bullet is aligned with the brass so that would be when the biggest misalignment would occur. That is why many reloaders advise seating your bullet a little, then rotating your cartridge once or twice before fully seating the bullet. I rotate my case after seating the bullet halfway and then seat it fully. I've never personally tested if this makes a difference. But that's how my Dad, very accomplished reloader and past competitor, taught me. David Tubb also taught this method in his old reloading videos with Sierra. Many accomplished reloaders and shooters have also talked of doing this. If seating didn't cause the most runout, then why bother with these techniques or dies with floating seaters and bullet guides.</p></blockquote><p></p>
[QUOTE="Jud96, post: 1826185, member: 69478"] My feelings aren’t hurt lol. My point of the test was to see if there was any difference between the two methods of sizing the necks. I have seen many comments and posts in the past claiming mandrel sizing reduced runout and how bad a button is for runout. So this was the purpose of my test. As shown, neither sizing method was significantly better than the other. I hear more about seating dies and bullet seating technique causing runout way more than I do about sizing and chambers causing it. Seating in my opinion causes the most runout, that’s when the bullet is aligned with the brass so that would be when the biggest misalignment would occur. That is why many reloaders advise seating your bullet a little, then rotating your cartridge once or twice before fully seating the bullet. I rotate my case after seating the bullet halfway and then seat it fully. I’ve never personally tested if this makes a difference. But that’s how my Dad, very accomplished reloader and past competitor, taught me. David Tubb also taught this method in his old reloading videos with Sierra. Many accomplished reloaders and shooters have also talked of doing this. If seating didn’t cause the most runout, then why bother with these techniques or dies with floating seaters and bullet guides. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair Expander Mandrel Die Test
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