Re: Powder for the 308 ?
Since you mentioned .223 - Reloder 15 is also my number one pick for .223/5.56 also... However I only shoot heavier bullets, 68gr. - 77gr. If I am shooting 55gr - 64gr., I use TAC or CFE-223.
The .308 is so easy to load for, and is so inherintly accurate anyways, it's hard to load a round that won't shoot well!
I chrono all my loads, and I stop based on velocity rather than pressure signs (of course unless I see pressure signs before I reach my target velocity), and RL-15 gives me either the fastest load, or one of the fastest in all my test loads for .223/5.56 and .308.
Right now I am developing a RL-15 load for the .30-06 using 150gr. Hornady Interbonds, 165gr. SST's, and 165gr. Nosler Ballistic Tips. So far am getting excellent groups, but only standard velocities... Still working upwards...
"It can be - done quickly, done correctly, or done inexpensively ... Pick any two."
"A government big enough to give you what you want, is strong enough to take what you have." -T. Jefferson