Well I would like 70 gr SPs, but in fact any 556 is going to be ok for what your thinking. Now most will never be shooting beyond 100-200 yards. so see whats good for you at the distances your thinking. I found that 70Gr. SPs work well for me out to 500 yards. 762X39 the 124 gr SPs are doing well. 762X51 well I like the 168 gr HPs. 9mm 124Gr. HPs, .45s 200 gr HPs. but for general use whatever you have will work.