Shoulder Bumping?

[LynnJr]

I was told that you can't bump a shoulder back on this forum.
What is this called?

[kevins750]

What cartridges are those?

[Capt.Dunsel]

I was told that you can't bump a shoulder back on this forum.
What is this called?

He will be here any minute

Looks like it is a "reformed" case , you didn't bump the shoulder , you "reformed" the shoulder to a new spot . ( that's what he will say )

I have one like that , 30 06 case necked to 22 cal , we made a few of those for a rifle we built , ate the throats real fast . was a fast wildcat , accurate , but it burned out the throat in a few hundred rounds .

[JackEllis]

Looks to me like the neck got stretched but the rest of the case was largely unchanged.

[kcstott]

I was told that you can't bump a shoulder back on this forum.
What is this called?

Well that ain't bumping. That shoulder is far more than bumped, that was pushed and pushed hard for a good distance. But Fuzzy nutts will be along anytime to split hairs over reforming shoulders, setting shoulders back, and bumping shoulders.

[croue]

Looks like a mercury rocket set for takeoff!


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[bigbossman]

But...... how many tensions?

[SonofWWIIDI]

I was told that you can't bump a shoulder back on this forum.
What is this called?

Uhhhh...photoshop?

[Bumslie]

Neck size that sucker

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[fguffey]

He will be here any minute

Thank you.

Bumping the shoulder back sounds cute, bumping the shoulder is as impossible as moving the shoulder back. Reloading is just too complicated for most. The reloader does not understand the shoulder they start with is not the same shoulder they finish with. They do not understand the new shoulder was formed from the case body and the old shoulder become somethin else. The picture proves the old shoulder became part of the neck.

The case on the left should have been trimmed big time'. Again, when forming 100 30/06 cases or 6mm Remington cases I have to trim between from 25" to over 30" from the case after forming.

The shoulder did not move back because it is impossible to do with a die that has case body support.

But if a reloader could manage to move the shoulder back he would crate a case with a bulge below the case body/shoulder juncture, and then if he was able to get real good at he could form cases with pleats, or folds lines an accordion.

And then it gets more complicated, 'bump' is a function of the press. I used an A2 RCBS press that had .032" cam over, AND THEN! It gets more complicated when identifying presses.

F. Guffey

[freonr22]

Trimming 25"-30"!!
Thats crazy!

[fguffey]

Neck size that sucker

I suggest the reloader learn to trim the length of the neck.

When my formed cases get into that shape I reach for the man tool, that would be the hack saw before removing (lower the ram) the case from the die.

After using the hack saw I use a file to finish. I have also used air craft counter sinks. But the answer that goes with the air craft counter sink could be too complicated for the reloader.

F. Guffey

[fguffey]

Trimming 25"-30"!!
That's crazy!
__________________

You are correct but not impossible; unless the reloaders can figure a way to move the shoulder back and or bump the shoulder back. The shoulder I finish with is not the same shoulder I start with.

F. Guffey

[fguffey]

Looks to me like the neck got stretched but the rest of the case was largely unchanged.

And then it gets more complicated; there is stretch and there is flow or is it stretch and flow? If the reloader could move the shoulder back and or bump it back the brass would not be able to stretch and or flow. If the shoulder could be moved back the brass would 'wad-up' below the shoulder of the die; now that is something that has to be complicated for a reloader to understand because the die has case body support, the support of the die prevents the case body from moving back.

Without case body support the case will bulge but reloaders do not understand that even when they try to crimp a case while seating a bullet. The seating die does not have case body support.

F. Guffey

[fguffey]

I have one like that , 30 06 case necked to 22 cal , we made a few of those for a rifle we built , ate the throats real fast . was a fast wildcat , accurate , but it burned out the throat in a few hundred rounds

A smith build a few rifles he called 22 6MM Remington improved; he was desperate so I got involved. He had no ideal how long his chamber was from the shoulder/datum to the bolt face. What he did know while forming and fire forming he suffered 60 % case head separation.

Anyhow I formed cases for his rifle and sent instructions. He told me it could not be done.

F. Guffey