after fullsize - "ring" at the bottom

[bsumoba]

and then;



Because you are on the 'U.S. RIFLE TEAM' I believe I am allowed to disagree with you. If the locking nut gets loose and the die backs out the distance between the shoulder and case head increases. When that happens clearance is increased. As you should know I am the one that cannot move the shoulder back when sizing a case with a die that has full body support. I am the fan of off setting the length of the chamber with the length of the case.

F. Guffey

I cannot follow your post...

If the distance between the shoulder and case head increases, then clearance is decreased in the chamber. The locking ring not being tight allows the die to move up and down.

You cannot set the length of the chamber (which is already cut) with the length of the case. You do it the other way around and size the case to your chamber.

Brass is very malleable. Brass will flow where it needs to flow and typically, brass flows upwards, hence the need for trimming. Happens all the time in FL sizing dies. Also, brass is not "fully supported" technically in a FL sizing die. The whole inside of the case is not supported.

[J-cat]

More like headcase separation,
OR more accurately case-head seperation...

Lol! not enough sleep

[The War Wagon]

Interestingly enough, I remember seeing West German (MEM?) .308 brass looking that NEW back in the day. Not sure why...

[fguffey]

You cannot set the length of the chamber (which is already cut) with the length of the case. You do it the other way around and size the case to your chamber.

I cut the 8mm/06 chambers with my reamer. I did nothing to the 8MM57 ammo, I chambered it and I fired it and was not surprise the cases did not come out the way reloaders thought they would. There was .127" clearance and the case did not suffer case head separation.

That is the reason long cases are my favorite cases, I purchase a rifle, I measure the length of the chamber from the shoulder to the bolt face; after that I start forming.

I off set the length of the chamber with the length of the case from the shoulder of the case to the case head.

Again: I have a M1917 with a chamber that is field reject length +.002”, that would be a chamber that is .016” longer than a minimum length/full length sized case or .011” longer than a go gage length chamber.

I off set the length of the chamber with 280 Remington cases, I adjust the die off the shell holder .014” and then start sizing/forming with a 30/06 forming die.

F. Guffey.

[fguffey]

Also, brass is not "fully supported" technically in a FL sizing die. The whole inside of the case is not supported.

Very good, that is the reason I say it is impossible to move the shoulder back when full length sizing with a die that has case body support. And then there is that thing with bumping.

The outside of the case is supported 100%, and then the case is empty, the inside of the case is not supported except by the case body itself, if the case is not supported on the outside when being sized the case will collapse. part if the collapse in inward and part of the collapse is outward, meaning the case is turned into something that looks an accordion a thermostat with bellows. To understand you would have to crawl under an old Volkswagen in the winter.

F. Guffey

I can move the shoulder of the case back and at the same time I can shorten the case from the shoulder to the case head; problem I can not do it with a die that has full case body support.

[J-cat]

OK, Joe.

[fguffey]

Typically, I see case head separation occur if you sized cases with more than 0.005" shoulder bump.

Shortening a case from the shoulder to the case head .005: is equivalent to sizing a case that is go-gage length to a case that is minimum length/full length sized. And I ask; "What is shoulder bump?".

Reloading forums have members that insist the case shortens .005" from the shoulder to the case head when the firing pin strikes the primer. If there was any truth to that 'once upon a time story' why wouldn't you size the case to go-gage length; meaning it would not be necessary to 'bump the shoulder? .005". If you are able to keep up the powerful firing pin strike and the bumping of the shoulder would result in .010" clearance before the bang.

F. Guffey

[divingin]

To understand you would have to crawl under an old Volkswagen in the winter.

I didn't think you could size a Volkswagen with full body support.

[fguffey]

I didn't think you could size a Volkswagen with full body support.

And I knew you did not know the thermostat in the old Volkswagen looked like the bellows in an altimeter.

F. Guffey

[Featureless]

Drop it in the chamber if it goes in all the way (that's what she said), it's GTG