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Rifles, Reloading, Optics, Equipment
Reloading
Is it possible that the ogive could vary .030" on different lots of Bergers?
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<blockquote data-quote="Gene" data-source="post: 432598" data-attributes="member: 7402"><p>Mike is correct. You may yet be a bit confused. First, never measure base of case to tip of the seated bullet. Forget the loading manuals "suggested OAL" cause that's how they do it. You need to find where the ogive touches the lands lightly. There are several ways to do this. I size a dummy round, seat the bullet where I think it will be close, measure it with my Davidson base and nosepiece, write that down. Each time I do this, I first wipe the bullet with 0000 steel wool. Assuming the first attempt was too long, adjust the seater die down about .010" and try again. Do this until the land marks disappear. Pull the bullet up slightly, raise the die adjustment about .005". Eventually, you will very barely see (I use a 6x jewelers loupe to see them) several rub marks where the ogive contacts the lands (you might see just two or three, that is OK). Write that measurement down and keep it for future reference. </p><p></p><p>When changing bullet lots, whether Berger or any others, always re-establish the same measurement. Yeah, its a PIA, but you can do it right or not. BTW, I shoot about 2000 Bergers and many others every year, and most of the time, the measurement has to be repeated every time I get a new lot. When you find the lot you like, buy several thou and check the measurement frequently. It will change as the throat wear advances.</p></blockquote><p></p>
[QUOTE="Gene, post: 432598, member: 7402"] Mike is correct. You may yet be a bit confused. First, never measure base of case to tip of the seated bullet. Forget the loading manuals "suggested OAL" cause that's how they do it. You need to find where the ogive touches the lands lightly. There are several ways to do this. I size a dummy round, seat the bullet where I think it will be close, measure it with my Davidson base and nosepiece, write that down. Each time I do this, I first wipe the bullet with 0000 steel wool. Assuming the first attempt was too long, adjust the seater die down about .010" and try again. Do this until the land marks disappear. Pull the bullet up slightly, raise the die adjustment about .005". Eventually, you will very barely see (I use a 6x jewelers loupe to see them) several rub marks where the ogive contacts the lands (you might see just two or three, that is OK). Write that measurement down and keep it for future reference. When changing bullet lots, whether Berger or any others, always re-establish the same measurement. Yeah, its a PIA, but you can do it right or not. BTW, I shoot about 2000 Bergers and many others every year, and most of the time, the measurement has to be repeated every time I get a new lot. When you find the lot you like, buy several thou and check the measurement frequently. It will change as the throat wear advances. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Is it possible that the ogive could vary .030" on different lots of Bergers?
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