Thread: Brass life

I thought as far as 7mm REM mag goes, the brass always starts getting the case head separation line.
Not because the die is set up wrong for head space, but just because it's factory head space length is so short the first firing gives it such a big stretch. It's where it starts thinning first. Being soft Norma might help your cause. I usually see the line at about 6 firings with hornady REM mag.

Originally Posted by bully

I thought as far as 7mm REM mag goes, the brass always starts getting the case head separation line.
Not because the die is set up wrong for head space, but just because it's factory head space length is so short the first firing gives it such a big stretch. It's where it starts thinning first. Being soft Norma might help your cause. I usually see the line at about 6 firings with hornady REM mag.

Nah, I think thats an old wives tale. My brass has flowed enough for me to need to trim after 5 reloads and this is from a book value, not from a known datum. Even then, Ive only removed 0.010 - 0.015" or fuck all. This means my brass is probably not thinning at the web. I would bet, that most issues are due to brass being overworked and there are people who agree with me Interesting read.

7grs of W296 pushing a 70gr lead gas checked projectile at 1680fps out of a 107 year old Winchester 1892 in 25-20wcf.

Cases are as rare as day old purple spotted rocking horse shit so I'm looking after them.

The first 50 cases have now survived 20 reloads with an anneal every 5 reloads, just because I can.

Cheers
Pete

Originally Posted by P38

7grs of W296 pushing a 70gr lead gas checked projectile at 1680fps out of a 107 year old Winchester 1892 in 25-20wcf.

Cases are as rare as day old purple spotted rocking horse shit so I'm looking after them.

The first 50 cases have now survived 20 reloads with an anneal every 5 reloads, just because I can.

Cheers
Pete

Can you neck down 32-20 as I have some?

Originally Posted by MSL

Can you neck down 32-20 as I have some?

Yes you can neck down the 32-20

Cheers
Pete

Originally Posted by kiwijames

Nah, I think thats an old wives tale. My brass has flowed enough for me to need to trim after 5 reloads and this is from a book value, not from a known datum. Even then, Ive only removed 0.010 - 0.015" or fuck all. This means my brass is probably not thinning at the web. I would bet, that most issues are due to brass being overworked and there are people who agree with me Interesting read.

Whatever your doing is working.
All my rifles are full length sized. I measure head space off a fired case and basically load it with the same measurment. Less than a thou bump. (Datum on the shoulder)
I see the line at about 6 firings on REM mag. I can at least double the amount of use on other calibres. And then stop for no apparent reason, just because maybe I should.
I recently asked the same question about when is my brass buggered on another calibre as there was no apparent signs after 13 firings.
So I just figured as I use the same method for all my calibres, it's REM mag brass for you, it's the initial stretch iv heard of that ruins case life. Maybe I'm wrong but I have no other explanation when it's compared to my other calibres.
As I say, whatever your doing is working

Originally Posted by bully

Whatever your doing is working.
All my rifles are full length sized. I measure head space off a fired case and basically load it with the same measurment. Less than a thou bump. (Datum on the shoulder)
I see the line at about 6 firings on REM mag. I can at least double the amount of use on other calibres. And then stop for no apparent reason, just because maybe I should.
I recently asked the same question about when is my brass buggered on another calibre as there was no apparent signs after 13 firings.
So I just figured as I use the same method for all my calibres, it's REM mag brass for you, it's the initial stretch iv heard of that ruins case life. Maybe I'm wrong but I have no other explanation when it's compared to my other calibres.
As I say, whatever your doing is working

My rifle may have a close spec chamber so the initial firing has minimal stretch? Ive only just FL sized this brass today and only because I could, no because I needed to. Would have been good to check with comparator before I bumped it to see. I will have original dimension in my reloading book I guess. Ive never had may troubles with the Blasers as far as fiddling with dies etc to get things to work.

Originally Posted by bully

Whatever your doing is working.
All my rifles are full length sized. I measure head space off a fired case and basically load it with the same measurment. Less than a thou bump. (Datum on the shoulder)
I see the line at about 6 firings on REM mag. I can at least double the amount of use on other calibres. And then stop for no apparent reason, just because maybe I should.
I recently asked the same question about when is my brass buggered on another calibre as there was no apparent signs after 13 firings.
So I just figured as I use the same method for all my calibres, it's REM mag brass for you, it's the initial stretch iv heard of that ruins case life. Maybe I'm wrong but I have no other explanation when it's compared to my other calibres.
As I say, whatever your doing is working

Have you checked it is the start of separation? Maybe just a bit of a polished spot?

Originally Posted by kiwijames

Have you checked it is the start of separation? Maybe just a bit of a polished spot?

Yeah iv cut cases open.
And yes, maybe mine is a large spec chamber.
With the comparator, off the top of my head the measurement is 1.215 if you have the Hornady comparator it might mean something if the bushings are close to the same.

Originally Posted by bully

Yeah iv cut cases open.
And yes, maybe mine is a large spec chamber.
With the comparator, off the top of my head the measurement is 1.215 if you have the Hornady comparator it might mean something if the bushings are close to the same.

That's not right, it's something . 1215

Originally Posted by bully

That's not right, it's something . 1215

LOL. I'lll take a nose at mine as I have the Hornady too.