Lonewolf74
Well-Known Member
- Joined
- May 12, 2016
- Messages
- 734
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
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