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Rifles, Reloading, Optics, Equipment
Reloading
Virgin versus once fired brass for accuracy, ??Best??
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<blockquote data-quote="Derek M." data-source="post: 223622" data-attributes="member: 2693"><p>Here's some info from a prominent barrel maker when asking about virgin v. once fired brass:</p><p></p><p>"On case roundness and many like tests that sound good I have found they do almost nothing. Of interest to this my friend Col. Sam Burkhalter spent a lot of time with the AMU. They found full length sized case worked better than neck sized. Don't know if I mentioned this in the past to you. Back about 10 years or so ago I went through all the case selection measure base web and etc. Weighed everything. Went to Racine for practice and shot a really good 600 yards. Told the guys what I had done and reached into to my box to wave the box of ammo in front of them. OOPS, I had shot the box of culls by mistake. This proved to me how much is what the shooter does. I assumed no error in the ammo to blame so I simply did a better job as nothing else to blame it on.</p><p> </p><p>Oh, what most don't see I have. I have a lot of pressure barrels and done a lot of pressure testing. Talk about touching lands: In a number of cases this causes pressure spikes. Worked with Federal on a project why some 6mm would blow primers. It happened in rough throated factory barrels which randomly slowed down the bullet motion at start. This is why touching is wrong as you cause the base of the bullet to distort more. Also you don't compress metal for the lands, it must move which is in length so a small jump actually helps you start. Also for alignment a throat wears faster at 6 O'clock then at the top so when touching it will tip. So much of what's common idea is simply male bovine excrement."</p></blockquote><p></p>
[QUOTE="Derek M., post: 223622, member: 2693"] Here's some info from a prominent barrel maker when asking about virgin v. once fired brass: "On case roundness and many like tests that sound good I have found they do almost nothing. Of interest to this my friend Col. Sam Burkhalter spent a lot of time with the AMU. They found full length sized case worked better than neck sized. Don't know if I mentioned this in the past to you. Back about 10 years or so ago I went through all the case selection measure base web and etc. Weighed everything. Went to Racine for practice and shot a really good 600 yards. Told the guys what I had done and reached into to my box to wave the box of ammo in front of them. OOPS, I had shot the box of culls by mistake. This proved to me how much is what the shooter does. I assumed no error in the ammo to blame so I simply did a better job as nothing else to blame it on. Oh, what most don't see I have. I have a lot of pressure barrels and done a lot of pressure testing. Talk about touching lands: In a number of cases this causes pressure spikes. Worked with Federal on a project why some 6mm would blow primers. It happened in rough throated factory barrels which randomly slowed down the bullet motion at start. This is why touching is wrong as you cause the base of the bullet to distort more. Also you don't compress metal for the lands, it must move which is in length so a small jump actually helps you start. Also for alignment a throat wears faster at 6 O'clock then at the top so when touching it will tip. So much of what's common idea is simply male bovine excrement." [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Virgin versus once fired brass for accuracy, ??Best??
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