RCModel is probably closest to the solution.
I found out really quick something to consider when loading for the 7mm08.
My Remington M7 in 7-08 was very "tight" seating the first ammo I reloaded for it back in '04.
I recieved 3 boxes of PMC factory ammo with the rifle. After firing the ammo in the rifle and getting "high-pressure" indications with the factory ammo (cratered primers), I figured it was just a "hot batch" of factory ammo. (It chrono'ed over 2,900fps from 20" bbl w/139gr Hornady bullet!).
After reloading the ammo with 140gr Sierra and Remington 140gr bullets, I found that most of the ammo wouldn't even chamber !!! I had trimmed the brass to min. spec. and polished/tumbled, ect., but hadn't measured the neck diameter loaded.
Some reformed .308wcf brass that I had trimmed chambered w/o a problem.
I eventually found that the neck's were over thick on the PMC brass, and my rifle has a rather "tight" chamber. Neck turning the brass has produced the most accurate brass I have now for this rifle.
So, check the brass and see where it's tight............ Mil-spec .308 (7.62Nato) runs somewhat thicker than commercial brass and if it's over-length (did you trim the cases before loading, you should have !!), or over thick in the neck, will cause hard or impossible chambering.
FWIW; most 7mm08's have at, or near, match tolerance chambers, so, you may have a "tight" chamber like I do.