Brass not stretching in chamber

[muleman69]

I'm wanting to set my die for headspace but brass is not wanting to stretch in the chamber ? some have been fired up to three times ? Do I keep on firing until bolt starts to get snug upon closer? Been neck sizing only? .280 AI and .300WM

 

[JRS]

Have you measured the case before and after firing it?

 

[Bart B.]

Reduced loads often cause that.

Are you using a neck only sizing die?

 

[dsculley]

Sounds like your chamber is on the minimum side of SAMMI. That is not a bad thing that brass is not being stretched. Just keep neck sizing until they are a snug fit in the chamber and you will know. Or you could do a chamber cast to measure your chamber dimensions.

 

[Bc'z]

My lapua only moved .002 after 1 firing.
Well see how far it moves after shooting 2nd firing today

 

[Bart B.]

Or you could do a chamber cast to measure your chamber dimensions.

Do chamber casts have headspace equal to that of chambers?

 

[243winxb]

Been neck sizing only

Set up a fl die with a .010" gap between shell holder and die. Size. See if case will chamber. If it doesnt, decrease gap by .002" till it chambers.

When and if the case body is sized smaller, the head to datum will grow, get longer.

 

[alinwa]

Do chamber casts have headspace equal to that of chambers?

"equal to???"

Will someone please explain the procedure for getting ANY headspace measurement with a chamber cast?

 

[6.5 Rooster]

Oh, that's easy! Simply pour your casting extra long. Remove the slug, chuck it in the lathe with the extra bit sticking out, dial it in, face it to length. Measure at your leisure.

Wait a minute... I may have overlooked something here

Rooster

 

[JFrank]

Set up a fl die with a .010" gap between shell holder and die. Size. See if case will chamber. If it doesnt, decrease gap by .002" till it chambers.

When and if the case body is sized smaller, the head to datum will grow, get longer.

Ah yes
Is amazing what one can do with a simple feeler gage and a threaded Die

 

[muleman69]

Have you measured the case before and after firing it?

Yes

 

[muleman69]

Reduced loads often cause that.

Are you using a neck only sizing die?

Yes

 

[muleman69]

My lapua only moved .002 after 1 firing.
Well see how far it moves after shooting 2nd firing today

Let me no as I have Lapua also

 

[muleman69]

Set up a fl die with a .010" gap between shell holder and die. Size. See if case will chamber. If it doesnt, decrease gap by .002" till it chambers.

When and if the case body is sized smaller, the head to datum will grow, get longer.

Maybe I'm missing something here,My brass is to short to do as you suggested.

 

[JFrank]

Maybe I'm missing something here,My brass is to short to do as you suggested.

Hit um harder

 

[muleman69]

Hit um harder

You are saying loader up?...lol

 

[Uncle Ed]

Maybe I'm missing something here,My brass is to short to do as you suggested.

A picture is worth a thousand words, when you full length resize your are squeezing the diameter of the case and it can becomes longer than the chamber. The at a certain point in the last few thousandths of ram travel the die starts to push the case shoulder back down.

Many cheap Marines use a full length die to neck size their cases and only size half the neck. This partial full length resizing method doesn't squeeze the case body enough to cause it to increase in length.

The above message was brought to you by the Air Force.
Aim High Air Force MAC 69-73

 

[Bc'z]

A picture is worth a thousand words, when you full length resize your are squeezing the diameter of the case and it can becomes longer than the chamber. The at a certain point in the last few thousandths of ram travel the die starts to push the case shoulder back down.

Many cheap Marines use a full length die to neck size their cases and only size half the neck. This partial full length resizing method doesn't squeeze the case body enough to cause it to increase in length.

The above message was brought to you by the Air Force.
Aim High Air Force MAC 69-73

eeZactly the way I do it.
Our moto was death from above.
101st AB

 

[muleman69]

A picture is worth a thousand words, when you full length resize your are squeezing the diameter of the case and it can becomes longer than the chamber. The at a certain point in the last few thousandths of ram travel the die starts to push the case shoulder back down.

Many cheap Marines use a full length die to neck size their cases and only size half the neck. This partial full length resizing method doesn't squeeze the case body enough to cause it to increase in length.

The above message was brought to you by the Air Force.
Aim High Air Force MAC 69-73

poor people have poor ways

 

[Uncle Ed]

poor people have poor ways

muleman69

This was simply a interservice rivalry humor and payback, I was in the Air Force and sent to MCAS Iwakuni Japan twice TDY
And the Gunny kept telling me I needed a haircut, and the other marines kept stealing our equipment.