Here's a copy of an older post of mine on .308/7.62x51 loading for the M14;
After resizing (with .308 Win dies) and checking trim length etc, you will also likely need to swage or ream the crimp ring around the primer pocket before inserting a new one with NATO cases.
To reload for your M14 type rifle you will need your prepped and sized cases,
Large rifle primers
spitzer (pointed) bullets in the 147-173gr range (ex 150gr FMJ, 168gr BTHP, 165 Ballistic Tip, 150gr Pointed soft point etc)
A powder in the suitable burn rate range for the action of this type of semi auto gas rifle such as IMR 4895, H4895, AA 2495, BL C2, H335, Win 748, IMR 4064 (and there are others).
Data from a reputable source or manual for 7.62 or .308 Win using these powders. Some people start at a lower than book load for the NATO cases.
I have found for me pressure was fine at the starting loads for .308 cases.