Push through rifle die..... RCBS summit...?!?!?! help

[robinzon]

Hey guys,

Some time ago I found an odd die that was a PUSH THROUGH type for rifle... This is not a pistol forming die or bullet lube.... I specifically remember it becuse they used a SUMMIT RCBS press with it (first time I saw that press)... its not a mainline die manufacturer if someone can tell me what it was... its driving me crazy.. Pretty sure it was for Rifle cases, as I said I can't remember what the purpose was

 

[jds holler]

Hmmm... perhaps to adequately size the web portion of the case where conventional dies don't sometimes size enough for reliable semi-auto function?? jd

 

[robinzon]

Could be but it was something specific. I cannot remember the manufacturer I even sent a link to my friend he can’t find it either ... it is not Larry Willis collet belted magnum die I have that one

 

[gme]

a ring die, for web sizing to fix bolt click

 

[robinzon]

a ring die, for web sizing to fix bolt click

could be who makes it????

 

[robinzon]

Ohh... patriot valley arms !!!! Thanks to JDS HOLLER to get me on right track

 

[Dusty Stevens]

A ring die properly sizes the base- its not a push thru because that proper small base dimension is smaller than the rim dia, therefore a push thru would have to be too big to actually work unless you distort the rim... just thinking out loud after trying to push a case thru a good small base die to get more of the base sized.

 

[robinzon]

A ring die properly sizes the base- its not a push thru because that proper small base dimension is smaller than the rim dia, therefore a push thru would have to be too big to actually work unless you distort the rim... just thinking out loud after trying to push a case thru a good small base die to get more of the base sized.

it may not push the case completely through but the design it employs has a piston in the shellholder which forces the case through the bushing .. I am guessing up to the rim ... however, as most modern cases are rimless (and mostly beltless) the rim is recessed so you could push the case through indeed its probably impossible to size the web as its very thick so I am not sure if it goes all the way through I guess it has to if there is no shellholder controlling the rim or you would have to bang it out of this die with a hammer

 

[Dusty Stevens]

lets just take a ppc case for example since im set up pretty proper for it. As you can see theres almost zero chamfer at the end of the die. This is one i made.




as you can see it sizes all the way to the extractor groove with nothing left

It sizes to the extractor groove .4375



all while the case rim stays .440.



here is a picture of a ring die made by pbike257.



so you can see how a properly sized small base die cannot possibly be a pass thru die. If it was .440 it couldnt be taken serious as a small base die.

 

[robinzon]

I understand the concept. Nonetheless PVA die is a pass through look at the video of them sizing a case it pops it right through the top ..... what I would really like to see is a 338 Lapua small base

 

[KMart]

The PVA die only goes up to the WSM size. That is in stock. All the rest are not in stock.

 

[Dusty Stevens]

I understand the concept. Nonetheless PVA die is a pass through look at the video of them sizing a case it pops it right through the top ..... what I would really like to see is a 338 Lapua small base

If its a pass thru it wont size the base enough. Maybe if its grossly oversized

 

[Dud]

Some cartridges have rebated rims...

 

[BoydAllen]

On the issue of sizing at the base of a case there is an issue that does not get discussed much, how far the chamber reaches down the case vs. how far down a die, set properly for the shoulder, reaches. As long as the die can reach a little farther than the chamber does, you should be fine. One of the issues is the size of a typical die's chamfer. Another is the headspace of the chamber. For a rimless case that has plenty of capacity, you could chamber short, and shorten the die, cutting off the chamfer, replacing it with a tiny radius. My Harrell Vari-Base dies base inserts hardly have any radius or chamfer at all and they work just fine. Cases vary quite a bit in the thickness of their webs. While you do want some overlap with the chamber, beyond a certain point it serves no practical purpose. In those instances where the web thickness is relatively thick, and the overlap more than it needs to be, the so called gap space could be increased a little bit to reduce unneeded chamber coverage at the base of the case. If one were chambering short, in addition to cutting off the die to remove the chamfer, the shell holder could be shortened a little. Of course the chambering, die and shell work would all have to be coordinated.