So how much does Sectional density come into play when it comes to delivering energy on target? Specifically a 277 cal 160gr Partition has an S.D. of .298 A 30 cal 165gr partition has an S.D. of .248 (Just for referance, for a 30 cal bullet to get an S.D. of 290ish its gotta weigh about 190gr) So if a 160gr bullet is launched out of my 270wsm @ about 2850 & a 165gr bullet is launched out of my 30-06 @ about 2850, wich bullet has more potential for laying the smack down on "X" critter? The 5 grain heavier 30, or the higher s.d. 270? I ask this, Not to start any arguements, but to help me decide wich Cal/cartrige to buy next. I already have a Model-70, 270 wsm with an unbelivably scary accurate 140 Accubond load. I'm not gonna swich from it. I already have an -06 that I shoot 165's & 180's out of. Plus, I just parted company with my 300 Wby, cause I'm REALLY wanting a 300 wsm for the simple fact that its Very high performance for very little cost. (60ish gr of powder vs 80ish, less expensive brass etc over the Wby) for 5-600yds on Bear, & Elk sized critters. Then someone just HAD to post a BLR in 270 wsm in the classifides, & it got me wondering...... Why not have two 270 wsm's. One for deer & smaller critters with the 140's, & one for Elk,& bear with the 160's out to 5-600 yds..... So now I have a moral delima. I'm a 277, & 30 cal freak, & personally have no use for 7mm's so if we could avoid that whole topic that would be nice. (no offence meant guys, its just a personal preferance thing) In the end ill probably end up with the 300 wsm in another Model-70 Winchester, cause that's just me. But it does make for an interesting technical discussion. What say you....?