The rifle in question is a Cooper M52 in 6.5-284. I bought it with a 26" Bob Jury barrel (well known barrel maker here in Alberta), that only had around 30 shots through it.
I bought new Lapua brass and loaded up some 140 VLD-H with H4831SC.
Started noticing clickers right away, at low powder charges. This was the first time I had felt this which led me to do as much reading as I could find, here and elsewhere online. I've measured the once fired cases and nothing seems to be out of line when compared to the virgin brass.
One thread was about how someone cured his clicker issue by turning the necks. Thinking this might be my issue I've spent some time buying turning equipment. Last night I was doing more measuring and recording the results, when I noticed what looks like machining marks on the brass where the body meets the shoulder.
I am able to reproduce these marks by simply chambering new brass, the marks are there when it is extracted.
Looking with my Teslong I see a raised burr of some type at the body/shoulder junction in the chamber. Is this small burr possibly causing this marking of the brass and creating friction, causing the tight extraction and clicking?
I'm hesitant to try turning the necks if that's not the issue.
Secondly, could this burr be cleaned up by a gunsmith?
Here you can see the small grooves/imprint going up the shoulder:
Just above 9:00 in the pic below you can see the raised burr, looking towards the barrel.
Here's the reflected image, looking at the burr from directly above, you can also see a 'snail trail', I suspect from the metal was gouged and created the burr.
The once fired brass shows little to no soot on the outside of the necks...
Does any of this make sense? I'd really like to start shooting this rifle.
I bought new Lapua brass and loaded up some 140 VLD-H with H4831SC.
Started noticing clickers right away, at low powder charges. This was the first time I had felt this which led me to do as much reading as I could find, here and elsewhere online. I've measured the once fired cases and nothing seems to be out of line when compared to the virgin brass.
One thread was about how someone cured his clicker issue by turning the necks. Thinking this might be my issue I've spent some time buying turning equipment. Last night I was doing more measuring and recording the results, when I noticed what looks like machining marks on the brass where the body meets the shoulder.
I am able to reproduce these marks by simply chambering new brass, the marks are there when it is extracted.
Looking with my Teslong I see a raised burr of some type at the body/shoulder junction in the chamber. Is this small burr possibly causing this marking of the brass and creating friction, causing the tight extraction and clicking?
I'm hesitant to try turning the necks if that's not the issue.
Secondly, could this burr be cleaned up by a gunsmith?
Here you can see the small grooves/imprint going up the shoulder:

Just above 9:00 in the pic below you can see the raised burr, looking towards the barrel.

Here's the reflected image, looking at the burr from directly above, you can also see a 'snail trail', I suspect from the metal was gouged and created the burr.

The once fired brass shows little to no soot on the outside of the necks...

Does any of this make sense? I'd really like to start shooting this rifle.