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Lee Collet Neck Tension Question

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Unread 02-13-2011, 11:11 PM
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Re: Lee Collet Neck Tension Question

Worth a try. Like boomtube said the springback with a Lee Collet will give you a larger ID unlike the springback with an expander type of die. Since you are sizing the neck down onto the Lee Collet mandrel, after the sizing pressure eases the brass will springback toward the direction from whence it came making the ID larger.

Now with an expander type die the expander expands the case outward so it will springback inward. Thus giving a smaller ID on cases.

Personally I like to use Lee Collet mandrels that are .003" less than caliber but I take a lot of care to ease the bullet seating process so the tighter neck does not cause me runout problems.
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