Neither the Sierra Second Edition (1978) nor the Speer #10 (1980) show a load for Winchester 630 powder in a 150gr bullet for the 308. None of my newer manuals have anything either.
You don't say if this is for a jacketed or cast lead bullet, but if you are shooting lead then Lyman Cast Bullet Handbook Third edition (1980) shows the following for a 151gr cast bullet from mold #311440 using #2 alloy (This is a flattened round nose bullet):
18.5gr start, 1942fps, 30,100 CUP
24.4gr max, 2301fps, 47,300 CUP
Interesting, they do not show a load using 630 for the 151gr cast bullet from mold #311466, a more classic round nose bullet, but many of the other powders are shown with similar loads as the other bullet. Most have the same or slightly lower start loads, and lower max loads.
Don't know if this helps.
Just a Shooter