Pressure issue (HeadSpace? )

[savagedasher]

ANY time! you leave ejector marks on a case head it is high pressure..........

It can be a false reading also . Nothing the blue painter tape won't tell . Larry

 

[John Russell]

Hi,
[...]... if I put another load in it and fire it and it still makes a ejector mark,it has to be a HeadSpace Issue!! Does that sound right or no?
Thanx Terry

No.

Headspace does not make ejector marks - it is usually pressure, but it can be a bit of a ridge of steel around the ejector hole.
The ejector hole is drilled, and if it is done with a dull drill, or too fast, there will be a little ridge - that will give you marks on the brass.
Make sure that is not what you are seeing.

 

[savagedasher]

No.

Headspace does not make ejector marks - it is usually pressure, but it can be a bit of a ridge of steel around the ejector hole.
The ejector hole is drilled, and if it is done with a dull drill, or too fast, there will be a little ridge - that will give you marks on the brass.
Make sure that is not what you are seeing.

When the fireing pin jams the case forward and the head space is excessive the pressure will jam the case to the bolt and you will get the marks he is getting . All my Ackley and dasher do it . Larry

 

[rifleman700]

When it is headspace issue they call it bolt thrust I think.

 

[John Russell]

When the fireing pin jams the case forward and the head space is excessive the pressure will jam the case to the bolt and you will get the marks he is getting . All my Ackley and dasher do it . Larry

He says, "if I put another load in it and fire it and it still makes a ejector mark,it has to be a HeadSpace Issue!! Does that sound right or no?".
If it a fired case, it will fit the chamber, so there is not headspace (unless he is over sizing with a FL die.

I shoot many heavy loaded cartridges, and none of them do this.

It is primers that force the case forward (they explode like a "ram-set").. not the firing pin.

 

[savagedasher]

He says, "if I put another load in it and fire it and it still makes a ejector mark,it has to be a HeadSpace Issue!! Does that sound right or no?".
If it a fired case, it will fit the chamber, so there is not headspace (unless he is over sizing with a FL die.

I shoot many heavy loaded cartridges, and none of them do this.

It is primers that force the case forward (they explode like a "ram-set").. not the firing pin.

Ever gun I have loaded in the last 60 year did . I recommend you get PO Ackley books
He explain it in detail. That is the reason the make head space gauges. I'm not trying to be disagree able just trying to help . Larry

 

[7Saum]

He says, "if I put another load in it and fire it and it still makes a ejector mark,it has to be a HeadSpace Issue!! Does that sound right or no?".
If it a fired case, it will fit the chamber, so there is not headspace (unless he is over sizing with a FL die.

I shoot many heavy loaded cartridges, and none of them do this.

It is primers that force the case forward (they explode like a "ram-set").. not the firing pin.

When I said another load I ment the load that I only neck sized that was already expanded to the size of my chamber,so there should be no moving to make a mark unless it was head space or now what u said about the roughly drilled hole...it is a stiller action,can it be fixed by me or is it a smith worthy problem...If that's what it is?
Thanx Terry

 

[7Saum]

It can be a false reading also . Nothing the blue painter tape won't tell . Larry

Curious what do u do with the blue painter tape?
Thanx Terry

 

[savagedasher]

When I said another load I ment the load that I only neck sized that was already expanded to the size of my chamber,so there shouldn't be no moving to make a mark unless it was head space or now what u said about the roughly drilled hole...it is a stiller action,can it be fixed by me or is it a smith worthy problem...If that's what it is?
Thanx Terry

Terry
Remove the firing pen take some blue painter tape put it on the case head trim it and close the case in the chamber you should feel some resistance add another and the bolt shouldn't close . If it doesn't work that way you have excessive head space . Larry

 

[savagedasher]

Check you barrel for a carbon ring and also case lingth

 

[John Russell]

Ever gun I have loaded in the last 60 year did . I recommend you get PO Ackley books
He explain it in detail. That is the reason the make head space gauges. I'm not trying to be disagree able just trying to help . Larry

I have Ackley's books - bought them in 1966. I am not new at this.

We obviously load differently - I do not have this problem in any off my rifles - and I have a lot.

 

[savagedasher]

I have Ackley's books - bought them in 1966. I am not new at this.

We obviously load differently - I do not have this problem in any off my rifles - and I have a lot.

Or do I
But I have seen others have problems. Simple check should find the problem but only if someone listens. Last two years I have tested Many of guns and seen that problem often in gas guns . All ended up being the brass not being right for the chamber. Larry

 

[7Saum]

I have Ackley's books - bought them in 1966. I am not new at this.

We obviously load differently - I do not have this problem in any off my rifles - and I have a lot.

I agree I'm just starting out,I don't have this issue in any other rifles I own either,the one time I get a custom built,this happens,that's why I am so anoyed,and want to figure it out..
Thanx Terry

 

['Freak]

With the pics blown up 1000%, it’s lookin’ to me (as other(s) mentioned before) more like an impression/indention on the case head put there by a raised edge about the parameter of the ejector’s bore; rather than brass flow into the ejector bore from way high pressure inside the case acting on the case head.

 

[7Saum]

With the pics blown up 1000%, it’s lookin’ to me (as other(s) mentioned before) more like an impression/indention on the case head put there by a raised edge about the parameter of the ejector’s bore; rather than brass flow into the ejector bore from way high pressure inside the case acting on the case head.

Is there a way to fix that problem (sanding around the ejector bore maybe?)
Thanx Terry

 

[John Russell]

Is there a way to fix that problem (sanding around the ejector bore maybe?)
Thanx Terry

Not "sanding" Sand paper doesn't work on steel.
I use 600 grit silicone carbide paper, with oil on it.

 

[7Saum]

Not "sanding" Sand paper doesn't work on steel.
I use 600 grit silicone carbide paper, with oil on it.

Nice,thanx

 

[/VH]

With the pics blown up 1000%, it’s lookin’ to me (as other(s) mentioned before) more like an impression/indention on the case head put there by a raised edge about the parameter of the ejector’s bore; rather than brass flow into the ejector bore from way high pressure inside the case acting on the case head.

...And thus no apparent swipe mark, either.

 

[fguffey]

I have seen factory brass up to .010 short on headspace.

My cases do not have head space but I have been impressed with factory, new over the counter case dimensions I have measured. When I have measured factory case length from the shoulder to the case head I have know the length of the chamber. I measured the length of the case to the case head to determine clearance. I have never been abele to get into that chamber head space and case head space thing because my case length gages are not head space gages and the other tools I use are comparators.

F. Guffey

 

[fguffey]

I still have the M1917 with the chamber that is .016” longer than a minimum length/full length sized case when measured from the shoulder of the case to the case head. When measuring factory, new out of the box ammo for that rifle the length of the case from the shoulder to the case head is .016” shorter than the chamber from the shoulder of the camber to the bolt face. For the 30/06 the .016” is .002” longer than a field reject length gage.

IN my opinion that could be too much case travel/clearance; I form cases for that chamber, I could go straight to fire forming meaning I could just pull the trigger. Problem: If I fire form the cases I create short cases from the end of the neck to the case head. I want to cover the entire chamber if possible, it is most difficult to cover all of the chamber with a short case.



F. Guffey