I also too am wanting to decide which one to load, until i found that the sciroccos are pure copper jacket. I want them for my .300 RUMS but i want to load with the 200gr; well, they dont make 200gr sciroccos, and the sciroccos foul more, so that kinda narrows it down a bit. I was thinking that the sciroccos were a tougher bullet than the NAB's are, am I wrong on that thought? I have heard a few guys out there that say they have had poor performance with the NAB and wont use them anymore. Can anyone shed a little light on this?