Hot very good at this type of discussion....but I haven't let that hold me back in the past.
BTW, bigngeen's dad, I think it was, was shooting a 6.5 Sherman today. Sweet!!!
Searching for the "right" bullet has been a quest of my for many years.
Regarding the 270 Win - the 90 gr Sierra HP was top notch of chucks and yotes out to only a little over 400 yards. With an MV of 3400 they were flawless, though not LR.
The 130 offerings in that caliber ruined the entire front half of a deer if shot at less than 200 yards. Thus all shots were taken at greater than 250 if at all possible.
Hornady Interbonds in 277 are the hardiest, toughest jackets around. They hold together when most other's dust at extreme velocities. But terminally perform flawless terminally in my experience. However their bc is the pits and the lead tip deforms. That gives me the vapors.
Nosler Accubond and ballistic tips have tough jackets, holding up well to the riggers of 3 groove 8 twist bores. They are accurate as a bullet needs to be and perform very well terminally. Even when hitting a deer sized animal at under a hundred yards.
After witnessing what a 375 cal 350 SMK will do to a darn good sized rock at 600 + yards, I think it was. At that distance the FPE is supposed to be nearly 6000 FtLbs. Seeing as that is the only bullet that I desire to have, I'd say aim for the biggest bone in the shoulder and let'r rip. This is said given the reported, by some, inconsistent "iffy" terminal performance
My experience shows that Aluminum tipped bullets if not constructed properly will shed the tip early on an give a very crooked path resulting in very poor penetration.
I suppose brass tips would do the same but so far the ones I'm working with are located in the media within 4 or so inches of the bulk of the bullet with an 18" penetration.
bc and accuracy are what it's all about. MV isn't that big of a deal when the proper bullet is used for the proper application.
A problem with bullet selection for LRH is that we are so few in numbers. (But growing)