308 Obermeyer Vs. 308 Winchester Why one over the other?

[skeeter]

Ok, forgive my ignorance but whats the difference and why would I choose one over the other?

Can I shoot standard off the shelf 308 win ammo in the Obermeyer chamber?

<munch>

[imschur]

I believe it's considered a wildcat and dimensioned slightly different

[imschur]

Just found this

[skeeter]

Just found this

Thanks,

So it seems the chamber is on the tight side of things. The reason I asked is I found a barrel on GunBroker that was listed as, NIB 20" Krieger stainless match barrel fitted with DPMS LR-308 barrel extension in 308 Obermeyer, chambered and finished by WOA.