Re: SIERRA M.K. OR SCIROCCO
If you can, pick up a copy of this month's "Shooting Times". Interesting articl regarding bullet performance, subject being .30 cal 180 gr bullets by several well known manufacturers. Performance in detail with photos. Surprise to me, the Swift A-Frame had highest weight retension of any at 3000fps impact(incl X-Bullets). Scirrocco's retained about 65% weight at that speed. At 2000 fps they ALL retained 80% or better, and that is the issue I think. What impact velocity do you project? At some point no bullet will expand on impact so placement becomes important. FWIW, the above article includes Sierra Spitzers, Hornady SST's and Nosler Ballist Tips.
I would choose the Scirrocco over the MK, but truth is, if you actually squeeze the trigger on something at that range and connect with any bullet, premium or not, it's pretty much toast. [img]images/icons/wink.gif[/img]