Thread: 300 Rum Brass Cases

Abe, my take would be, by extending the length of the loaded round you have increased the volume in the case and therefore reduced pressures.

Here is a link to a Brian Litz article which is good http://www.bergerbullets.com/wp-cont...13/03/COAL.pdf

Originally Posted by stug

Here is a link to a Brian Litz article which is good http://www.bergerbullets.com/wp-cont...13/03/COAL.pdf

Maybe it’s enough if you are approaching the extreme limits of pressures but if you run a "lab test" in Quickload by changing the COAL it makes bugger all difference apart from cases where the bore is large compared to case capacity, I.E. 30BR. In a case like the 300rum seating depth will have a very small impact on pressure due to the already huge case capacity and relatively small % change you are causing by seating the projectile deeper or not. Litz is right of course but he doesn’t quantify it with numbers to say how much and he doesn’t acknowledge the importance of relative bore size to case capacity. All in all buggered if I know why he is getting the results he is...

I would agree though that changing to a harder brass to stop getting pressure signs is not my idea of safe reloading practice, if you're pushing the envelope that hard you had better hope you have a good understanding of what your pressure is doing in different environmental conditions too...

Point is if a said chamber is 'warm' in some brass and burning out pockets Wtf is finding harder brass going to do? Hide the fact it's 'warm' for x speed ?

Next point is by changing a few things 'simular' to edge +p. . . . . The pressure can be dropped. . . . . . Charge can go up safely .. . . . . . . An speed increases naturally.

I said tweaked, never said what I done. The loads where given to me, I fired it to see first hand. . .. . An modified after, I was putting the facts up of what was found an what it went to. . . . .Or do I hide that info?

I don't run any 338s personally either




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Originally Posted by tui_man2

Point is if a said chamber is 'warm' in some brass and burning out pockets Wtf is finding harder brass going to do? Hide the fact it's 'warm' for x speed ?

Next point is by changing a few things 'simular' to edge +p. . . . . The pressure can be dropped. . . . . . Charge can go up safely .. . . . . . . An speed increases naturally.

I said tweaked, never said what I done. The loads where given to me, I fired it to see first hand. . .. . An modified after, I was putting the facts up of what was found an what it went to. . . . .Or do I hide that info?

I don't run any 338s personally either




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Wasnt a dig bro. I was just lost in your description. I am with you now We did it with my wee spud gun and it was an amazing the diff in pressure but I never gained much in speed. Maybe another powder?.

I'm not very good at explaining what I mean via writing i know what I mean but it never comes out right, I should just stick with letting my hands do the work.

It was simular Dave to this at this is little different again :thumbup:

Looking forward to other replies, everyone seems to scared to reply and just look. . . . . . Or throw in the trumps card?

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Originally Posted by tui_man2

I'm not very good at explaining what I mean via writing i know what I mean but it never comes out right, I should just stick with letting my hands do the work.

It was simular Dave to this at this is little different again :thumbup:

Looking forward to other replies, everyone seems to scared to reply and just look. . . . . . Or throw in the trumps card?


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Its not a huge secret but it can be an advantage and seems to improve larger bores better. I may try some N560 Abe so I will grab some off ya if you have any as well as the other stuff I am bludging?
Just leave the reloading room open and KJ and I will help ourselves when we come up in a couple weeks

Originally Posted by baldbob

Might be your dyslexia talking? Or maybe the fact you even confuse yourself alot of the time... :rolleyes:

It will be :thumbdown: I do the old brain only processes so much at once I have alot of shit i have to write down these days or I forget. . . Must be getting old. ...

Originally Posted by R93

Its not a huge secret but it can be an advantage and seems to improve larger bores better. I may try some N560 Abe so I will grab some off ya if you have any as well as the other stuff I am bludging?
Just leave the reloading room open and KJ and I will help ourselves when we come up in a couple weeks

Its a little different to what we done though but not alot like everything small tweaks. Year mate ill have some of that there for you to. Lol go for it the misses will clean up your mess even an put shit where I can't find it . . . . Like normal or my little helper does


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Originally Posted by tui_man2

It will be :thumbdown: I do the old brain only processes so much at once I have alot of shit i have to write down these days or I forget. . . Must be getting old. ...



Its a little different to what we done though but not alot like everything small tweaks. Year mate ill have some of that there for you to. Lol go for it the misses will clean up your mess even an put shit where I can't find it . . . . Like normal or my little helper does


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I am pretty sure I know what you did. Sneeze and I have discussed it over a whiskey. I havent even met your missus and she growled at me. She scares me! We will just raid Adams if she is home

Originally Posted by tui_man2

I'm not very good at explaining what I mean via writing i know what I mean but it never comes out right, I should just stick with letting my hands do the work.

It was simular Dave to this at this is little different again :thumbup:

Looking forward to other replies, everyone seems to scared to reply and just look. . . . . . Or throw in the trumps card?

Sent from my GT-I9300T using Tapatalk 2

Might be your dyslexia talking? Or maybe the fact you even confuse yourself alot of the time... :rolleyes:

I had heard that Kirby Allen would use hornady brass to determine pressure with his 338 Lapua wildcats and then change back to Lapua brass

That's not really an accurate way of doing it either is it. Internal volumes and case shapes could very a lot, data gathered for one case could be dangerous in another potentially.
I guess you have to determine pressure some how tho and it obviously works for him.

Yes you are right normally, but Hornady 338 lapua brass is a lot softer than Lapua 338 lapua brass. Lapua 338 lapua brass doesn't normally show pressure signs until way past normal safe pressures.

Originally Posted by stug

Yes you are right normally, but Hornady 338 lapua brass is a lot softer than Lapua 338 lapua brass. Lapua 338 lapua brass doesn't normally show pressure signs until way past normal safe pressures.

What are safe pressures?

Sorry, I couldn't resist it... Back to the interesting discussion :thumbup:

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Originally Posted by The Claw

What are safe pressures?

Sorry, I couldn't resist it... Back to the interesting discussion :thumbup:

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5psi is safe