"Clocking the barrel"
From Lilja rifle barrel site:
https://riflebarrels.com/shop/drop-in-barrels/anschutz/anschutz-model-200713-precision-barrel"Beginning in January of 2011 we have changed our barrel shank design from a copy of the Anschutz factory style to a modified 360º radius cone shape.
The advantage to this style is that it allows the shooter an
infinite number of positions the barrel can be rotated to.
This allows fine tuning of the barrel. The
chamber end of the barrel is machined so that the extractors will work in any position. The Lilja logo and cartridge designation can be placed in the traditional position but you are not limited to that."
Clocking the barrel means that you can rotate the barrel (12o'clock, 3o'clock, 6o'clock, 9o'clock), then headspace with a go gauge, without regard of extraction cuts
because no more extractor cuts on a cone-shaped end shank.
For example, on a regular rifle, the barrel markings are on the left-side of the barrel in about a 10o'clock mark.
You cannot clock a regular barrel because of the extractor cuts will not allow you to do this.
The Lilja cone-shaped end allows me to put the Lilja barrel markings at 3o'clock.
I've read about clocking barrels, but really have not gone too deep on rotating barrels. I haven't noticed much difference. I clean my action & barrel every couple of months
and I rotate the barrel and play with the headspace with my go gauges. I try to change them a little every time, but haven't seen any great change - good or bad.