Question about strange markings on brass

wayupnorth

wayupnorth

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I have a question about strange markings on brass for a brand-new rifle I just picked up.
The rifle is a Ruger Ranch in 450 Bushmaster.
The rifle is factory new and the calibre is a new one to me.
I picked it up as I wanted to try it out and have some trigger time on this calibre for interest's sake.

I noticed when I was collecting all my brass that there was a lot of dark fouling on the distal end of the brass.
Upon thinking about it it makes me wonder if the receiver is not fully supporting the brass in the chamber.
what else would cause all that gass and crud to come back and foul up the brass?
ill post the pics in a sec, I have to fetch them off my phone.

now, maybe I'm out to lunch on this as I don't shoot many straight-walled cartridges.
so if this is normal just let me know.
many thanks for the help and guidance.
 
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Can happen from low pressure, some ball powder is pretty dirty and slower to ignite leaving some carbon. Nothing to worry about.
 
Is it factory ammo or hand loads? Reduced loads do leave more carbon stains at the mouth and neck area of the case. Ball powder also leaves carbon stains as such.
 
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Lower pressure likely, seeing as it looks like factory loaded ammo I would try a different brand if you have anything available. It might mean more cleaning as fouling will be more apparent, have had this happen while working up a load in 10mm. Once I got over a certain powder charge things cleared up, no fowling on the case mouth and the pistol was much cleaner in the action and down the barrel.
 
Lower pressure loads in straight wall cases will soot up things to some degree depending on how clean burning the powder used is.
My RAR 450 runs very clean with 360 gr hardcast driven by 27.0 gr of 5744 which is a sensibly warm load in these little Rugers.

CLEAN SHOOTING LOAD.jpg
 

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cool, thanks guys.
ive just never seen that much soot on my brass.
but live I said I think this is my first time shooting straight-walled in a rifle.

ya, factory Hornady Black is what I was shooting.
 
Might be just my eyes, OP, but as if the brass in your picture most all have a "U" shaped soot pattern? Or is that just me making up stuff from your picture - is as if the round not sitting concentric within that chamber - would think the soot would be more or less even all around the circumference?
 
Potashminer said:
Might be just my eyes, OP, but as if the brass in your picture most all have a "U" shaped soot pattern? Or is that just me making up stuff from your picture - is as if the round not sitting concentric within that chamber - would think the soot would be more or less even all around the circumference?
Click to expand...

Straight wall case w/ too slow burn rate powder & gravity.

Any straight wall case unless sized a couple thousandths smaller than the chamber will have blow by...check any rimmed revolver round after firing.

The blow by is at the top of the case,gravity has the case resting at 6 oclock in the chamber.
 
Potashminer said:
Might be just my eyes, OP, but as if the brass in your picture most all have a "U" shaped soot pattern? Or is that just me making up stuff from your picture - is as if the round not sitting concentric within that chamber - would think the soot would be more or less even all around the circumference?
Click to expand...

that is exactly what I talking about.
there was a lot of dark soot and it was longer in one area and it was like that on all the brass.
really made me think that the brass was unsupported by the chamber or something.
The gun shoots well so I'm guessing it's okay.
 
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