What your asking is very selective to YOUR rifle, each and every one has it's own likes and dislikes so the only way to find out is to test yours. Read the suggested loads from the manuals and then make a decission.
What I can tell you is my 20" mod. 10LE likes 150 gr. smk with 41.8 grns. IMR 4895, my other 308 that I put together with mod. 12 single shot and now with a Criterion 26" barrel is a work in progress(hoping to finish this weekend) is coming in with a 42.6-42.8 grns. of the same powder. we will see.
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