Excessive pressure

[AMoorlen]

Started developing some non-toxic loads for my 30-06 and have noticed signs of excessive pressure on the fired cases.
I've loaded some fox to a standard length and as the marks on the case are very slight I'm wondering if I seated the bullet closer to the lands I would reduce neck tension and lower the pressures?

TIA

 

[MAH]

Can you pist a photo if the cases showing the head and spent primer.
M

 

[paul o']

Found fox classic 130 in .270 preferred being set back in the case .Ed at Edinburgh rifles may have just the data your looking for without spends on bullets chasing a load.
What pressure signs all i can see are sizing marks without a bulge or case separation marks.
Do you use a mandrel to size your necks or a ball that you push the case to size but then stretches the case to retrieve the neck expander.
As said can we have pix of primers and head of case .
Are you getting a stiff bolt after firing or and problems closing pre firing.

 

[jthyttin]

if I seated the bullet closer to the lands I would reduce neck tension and lower the pressures?

Don't know what you mean by reducing neck tension (having less/shorter contact between neck and bullet?)

But loading closer to lands will INCREASE the pressure in most cases, since bullet has less velocity (=more resistance) entering the lands and smokeless powder has progressive burn rate.

EDIT: forgot to mention, try to measure at which COAL bullet is contacting the lands. Your pressure signs might be due to shorter jump to lands than with the data you're using (i.e. different barrel for which data was developed)

 

[Malxwal]

A generally accepted thing with copper is to have them seated as a minimum of .050" off the lands.

 

[Smellydog]

I don't see sign of excessive pressure in those photos.

 

[r judd]

Only marks i can see on the cases are sizing marks

 

[Milk no sugar please]

Only marks i can see on the cases are sizing marks

Agree, looks like witness marks from fl sizing die. Nothing a quick stint in the tumbler won’t fix

 

[AMoorlen]

Can you pist a photo if the cases showing the head and spent primer.
M

By sounds of it I'm worrying about nowt, but photos below. First of the fox 150gr and 2nd with VP 140gr. Both with n140.

 

[AMoorlen]

Agree, looks like witness marks from fl sizing die. Nothing a quick stint in the tumbler won’t fix

Ok that's good. Although they weren't on there before hand and got worse as the powder charge increased hence why I questioned it. No feel as you pass your finger over the line though

 

[Rory]

By sounds of it I'm worrying about nowt, but photos below. First of the fox 150gr and 2nd with VP 140gr. Both with n140.

Looks normal to me.

 

[MAH]

By sounds of it I'm worrying about nowt, but photos below. First of the fox 150gr and 2nd with VP 140gr. Both with n140.

I'm not an expert.
But they don't show signs of over pressure.
Google signs of over pressure in primers .
You'll find some good images.
M

 

[Utectok]

A generally accepted thing with copper is to have them seated as a minimum of .050" off the lands.

Sometimes upwards of 120thou

 

[Utectok]

By sounds of it I'm worrying about nowt, but photos below. First of the fox 150gr and 2nd with VP 140gr. Both with n140.

Look normal to me

 

[Smellydog]

Nothing wrong. Now shove some powder in and stop worrying.

 

[Donkey Basher]

By sounds of it I'm worrying about nowt, but photos below. First of the fox 150gr and 2nd with VP 140gr. Both with n140.

Nothing wrong with those.

 

[hybridfiat]

I shouldn't say this but I shot a rifle for 25 years that cratered primers every time.
No issues, the rifle is overstrong and it shot best at the limit.

 

[paul o']

All good nothing wrong there just except you now reload and you will get a OCD flush now and then .