RE: Utilizing 307 load data for 308 cases?
By all means you can use the bullets intended for use in the .30-30 and .307 as long as they are .308 diameter bullets in your .308 Winchester. Why not use the load data for the .308 then?.....
I've loaded .30-30 bullets in a .30-06 using data for the .30-06 and those 170 grain bullets move right along.