So Im new around here, been reading the forum and various discussions for probably 3 months and finally registered tonight because I have a question that has been burning a hole in my brain for quite a while. I currently own a .308win that has recovered 95% of the deer it has been aimed at over its lifetime (5% were definite operator error), absolutely love it, but recently read a ballistics table I stumbled upon for a 270WSM and fell in love. I know for paper punching the 7WSM and 300WSM are probably better but for hunting out to 600yds on East Texas whitetails a 270 WSM in 150gr is about to make my wallet lighter... gotta convince the wife why I need to replace a perfectly good hunting rifle first (shes sitting on the couch across from me scowling as I write so my case may not be so strong right now). Anyways, back to the question that has driven me crazy for nigh on a month. I load my .308 with 180gr nosler ballistic tips, I know that's way too much bullet for whitetails but my gun loves absolutely loves the 180grainers and printing .25-.50MOA 100yd groups out of model 70 featherweight with nothing more than a massaged trigger makes me feel like a real hero from time to time, my excuse is that I hunt in heavy brush and Im lazy and dont like walking around in the cold among huisache thorns trying to find a deer that ran. Anyways, I also like the 180BT because of the .507 BC they make a nice long range load, as I get a chance to shoot at 1000yd plates from time to time. Anyways, to my new love, the 270WSM I noticed the 150gr nosler BT's for this check in just shy of .5BC at something like .493 whereas a Hornady interbond of the same weight is a whopping .525 which at the advertised MV of 3100fps is a mere 6MOA holdover at 500yds when sighted at my preferred 200yds. For hunting I don't care much past 500yds because that is the longest I can viably shoot at my current hunting spot, so a >.500 BC is really not a big deal. Now when I read this I looked up the 180gr interbond for .308 a respectable but not astonishing .480, I was a little bit baffled because my findings from the .277cal bullets would suggest it to beat out the Nosler BT but for some reason or another the .308cal Nosler is better BC wise than the Interbond despite being similar bullet designs to their smaller .277cal little brothers. Anyone have a guess as to why?