[CTcard]

...  I'm guessing if Christian has been working on his 40 time, he'll beat the 4.50...whether he goes below 4.4 is another story.  This site has Christian at 4.48, third fastest among running backs...and he's the third rated running back and projected to be a first round pick:
http://www.nfldraftscout.com/ratings/pro...&order=ASC

And IIRC, the 20 yard shuttle time is considered more important for running backs than the straight line 40 time. 

That site appears to "project" a 40 time, rather than report an actual measurement, though I cannot find that stated explicitly.
[and they do project some other RBs faster if you go to the ensuing pages]

I would also expect McCaffrey will break 4.50, but expect he will not break 4.40 (the time put forward by OF for McCaffrey to be a first round pick - or perhaps to guarantee he'd be a first round pick).

I also agree that the shuttle is more important, or at least ought to be.

[CTcard]

...  I'm guessing if Christian has been working on his 40 time, he'll beat the 4.50...whether he goes below 4.4 is another story.  This site has Christian at 4.48, third fastest among running backs...and he's the third rated running back and projected to be a first round pick:
http://www.nfldraftscout.com/ratings/pro...&order=ASC

And IIRC, the 20 yard shuttle time is considered more important for running backs than the straight line 40 time. 

That site appears to "project" a 40 time, rather than report an actual measurement, though I cannot find that stated explicitly.
[and they do project some other RBs faster if you go to the ensuing pages]

I would also expect McCaffrey will break 4.50, but expect he will not break 4.40 (the time put forward by OF for McCaffrey to be a first round pick - or perhaps to guarantee he'd be a first round pick).

I also agree that the shuttle is more important, or at least ought to be.