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Finally, I got my Hornady COL measuring tool.
On my Steyr SSG04 300WM, I got some very long chamber throat.
Bullet is 0.308, 208-gr A-max

I measured Base-to-Ogive: 3.920", 0.010" off the lands results with 3.910".
measured base to tip of the A-max COL was 3.635"

Now, spec COL for 300 WM is 3.340"

So, 3.635" - 3.340" =0.295" , that is almost 1/3 of an inch.

Is that possible with 208gr A-max?

DubiousDan wrote:Not all throats are created equal. Some manufacturers were known for having long throats and some use longer throats for higher pressure cartridges to prevent over pressure.

Correct, as well as, the steyr has a magazine that can accommodate larger COAL than spec. I will be loading at Spec plus +0.010". I am now loading at 70gr of Alliant 4000MR. One day I would work some rds so to get the OWC (best weight of power that maximizes accuracy for given bullet)