Cs22 Wrote:Yea, that's what I was afraid of. I guess it's true what they say. Buy once, cry once. Im considering a redding type s die. With my chamber though that would mean a jump of about .014 to get .003 neck tension? Is that possible with these bushings?
Cs,
Unsure what you mean by .014 jump will give .003 of neck tension. Jump and neck tension are mutually exclusive and controlled by two different dies. Jump is controlled by how deep you seat the bullet and neck tension is about how much you squash the neck in when sizing. You vary the amount of neck tension with different bushings in the S sizing die, while jump is controlled by screwing in and out the seating die.
With an AR the mag length is almost always the controlling factor in jump, and in that you don't get to choose the jump. The upside is, having to seat the bullet to fit a mag you end up with plenty of surface area gripping the bullet which is what you need in an auto loader, and it makes for more consistent tension.
What bushing you choose will depend on the neck thickness of your brass and the amount of springback. KS' .287 sounds about right, I use an S die for 6.5x47 bolt gun and it is .288, but it is a bolt gun.