dirty 357 brass PIC

[lone ranger]

I picked up 150 brass today for my 357. I have never seen so much crud up under the lip. I had to dig it out with an AWL. It was like hard carbon.
My old brass has been re-loaded 4 times and has NO black ring.What causes this much build-up ??
My brass is on the LEFT..Dirty on the RIGHT.

 

[browningautorifle]

Probably light loads. It won't obturate correctly and you get blow by. Some powders aren't the cleanest either.

 

[sunray]

Most likely whoever you got 'em from never cleaned them or his revolver. Isn't due to underpowered loads as you can load 'em to .38 Special velocities with no fuss.

 

[tigrr]

I know a guy who doesn't own a brass polisher. We would sort out 9mm and 45 and 38s and take home a handful. I think thats how he got clean brass every once in a while. I wouldn't want his dies either. He never ever polished his 9mm brass.
A stainless steel hand brush, one of the dollar store cheapys and a good soak in hot water with automatic dish soap in it, wait 1 hour rinse and it brushes right off.

 

[lone ranger]

Thanks all, for your input. Back to the shop I go.