What exactly is this used for?

[squirrelsnpr]

http://www.precisionreloading.com/mm5/merchant.mvc?Screen=PROD&Store_Code=PRE&Product_Code=KMDB&Category_Code=ARBOR_PRESS

I am looking to order the K and M Arbor press with force measurement and saw the item listed above was needed when using the Wilson dies. I'm not sure what it does. I only plan on using the arbor press to seat the rounds; would I still need this?
Thanks,
Mitch

 

[Preacher]

If your die came with the small cup to hold it, you don't need that part..
if your popping primers out you'll need it, or one like it...

 

[TonyR]

I have some parts that look similar to that for my Wilson dies, but, whatever it is, you don't need it to seat bullets with a Wilson die. The Wilson seater die comes with a little base piece that keeps anything from touching the primer when you are seating the bullet. The piece you are asking about may be a filler piece so you don't have to readjust the press when you switch from long and short cartridges. You have to loosen up several allen screws to change the distance between the bottom of the press ram and the base, so a filler could help reduce the need to do that. It also could be used with the Wilson neck sizing dies so the spent primers have somewhere to go when you knock them out of the cases.

 

[BoydAllen]

The piece that you asked about is designed to be used with a Wilson neck sizing die. You will note the recess in the top that is designed to receive the head of the case. First the unsized case is inserted in the die and it is placed on the base, case head up, and the arbor press ram is used to push the case flush with the die, sizing the case neck in the process. Then the die is flipped over, on the same base, and the the ram is applied to the decapping punch, which pushes the case out of the die to the point that it hits the bottom of the recess and the punch then pushes the spent primer out of its pocket. Then the die may be removed from the base, the sized, decapped case removed, and the process repeated for the next case. The reason for the height of the base is so that the shorter neck sizing die may be used at the same press height setting as the taller seating die.

 

[bheadboy]

in early bench rest, reloading, hand held neck dies were common, the case hammered or press seated in the die, then a punch with primer pin used to knock it out of sizer

then the case, powder and bullet were set in a base like this and either pressed together or leather hammered to seat the bullet,

this base is only needed of you do not have a "base cup"
with a primer clearance pocket.

Bob