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Na definitely not, was hard to capture the ridges without the light making it look like there were all kinds of lines running up the body, no lines on the bodies

Thanks, that’s quite useful for me. I had a play and made some minor adjustments to setup and I’m no longer getting the prominent ridges. Will still check the chamber to see if there are any issue...

Thanks for the input everyone, next task will be to check the chamber area, will post if anything untoward is found

Have found some articles online re these marka now that I know what to search for, fairly common it would seem

Ah ok, new to all this so keen to learn

Ok soooo I just put one of the non-ridged S&B cases through the collet die on a hunch…. First time with no pressure, second time with the pressure I have applied to the neck size cases. The second...

This is a better photo242945

Trick of the light, only on the neck, almost wondering if it’s from the rifling…

I’ve got a whole bunch of once fired .303 PPU brass with these ridges in the necks. The brass was fired between 3 diff .303s, but mainly a No4 Longbranch. I recently fired some factory S&B rounds...