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Rifles, Reloading, Optics, Equipment
Reloading
338 Norma Improved
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<blockquote data-quote="Lonewolf74" data-source="post: 2122533" data-attributes="member: 96274"><p>So I'm building a 338 Norma magnum and decided to go with an improved version. This is my first venture into a "wildcat" of sorts. The part I could use a little help with is the fire forming process.</p><p></p><p>The reamer I specd out for the 300 grain Berger's but did stay on the conservative side in case I wanna play with the 250's. My throat is .010 over CIP. I believe if my calculations are correct this will put the 250 .060-.070 off the lands with enough seated in the neck. The reamer and go gauge is -.004 which I believe is pretty standard for AI and should give me some crush on the neck, shoulder junction when chambering CIP spec ammo.</p><p></p><p>The real question I have, is it necessary or advised to have jam on the bullet when fire forming? I was thinking about buying some of the cheapest bullets I can find to form but that may not be possible if I need to jam the bullet because they will be too short? And along the same lines how do you shoot factory ammo if needed in a pinch since you won't have control over seating depth?</p><p></p><p>This also leads to the question if I decide to try the COW method how do you go about it with no bullet to jam? I'm not sure I understand how some people go about it when they say they create a false shoulder on the neck to head space off of?</p><p></p><p>Thank you for any help and advice</p><p>Joshua</p></blockquote><p></p>
[QUOTE="Lonewolf74, post: 2122533, member: 96274"] So I’m building a 338 Norma magnum and decided to go with an improved version. This is my first venture into a “wildcat” of sorts. The part I could use a little help with is the fire forming process. The reamer I specd out for the 300 grain Berger’s but did stay on the conservative side in case I wanna play with the 250’s. My throat is .010 over CIP. I believe if my calculations are correct this will put the 250 .060-.070 off the lands with enough seated in the neck. The reamer and go gauge is -.004 which I believe is pretty standard for AI and should give me some crush on the neck, shoulder junction when chambering CIP spec ammo. The real question I have, is it necessary or advised to have jam on the bullet when fire forming? I was thinking about buying some of the cheapest bullets I can find to form but that may not be possible if I need to jam the bullet because they will be too short? And along the same lines how do you shoot factory ammo if needed in a pinch since you won’t have control over seating depth? This also leads to the question if I decide to try the COW method how do you go about it with no bullet to jam? I’m not sure I understand how some people go about it when they say they create a false shoulder on the neck to head space off of? Thank you for any help and advice Joshua [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
338 Norma Improved
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