I don't feel the hype for the 257 Weatherby Magnum or 300 Weatherby Magnum.
Take the 270 Winchester and Nosler 110 grain Accubond's, can easily nips the heels of the 257 Weatherby Magnum and/or 264 Winchester Magnum if desired.
Also the 338-06 A-Square with Nosler 180 grain Ballistic Tip and /or Accubond's, get close enough too some 30 caliber magnum cartridges if desired.
Both 270 Winchester and 338-06 A-Square are in a inexpensive reformed brass.
yooper77
A 338 cal. bullet with a BC of .372 vs a 30 cal. bullet with a BC of .507 traveling 100-200fps faster, doesn't seem comparable to me.
I have a very accurate 270 & it is a fine cartridge. If it fits your performance needs & it would for most, fine. But no, the 110Accubond is not impressive to me. I do love the 140 Accubond & it has a great BC for a 270, but it falls short of 6.5 bullets & combined with higher 264 velocities, a whole herd of them.
But looking at the 110 Acc/.277 you can get 3300, maybe 3350. With a 264 with the proper barrel & Retumbo/RL25 you can get 3300 with a 130 Accubond.
Now look at bullet stats:
110/.277 Acc.: SD.238 & B/C.370 It is a pretty blunt bullet as we can see
130/.264 Acc.: SD.266 & B/C.488 Great penetration & High BC, not even a close contest. And man if you want to talk long range, a 140 6.5 Berger at 3200 is amazing, the Berger 270 BC's are much lower & so is the vel.
The 270 is a little closer contest with a 257 110, but still falls a little short & picking the optimum loads for both, the 257 Wea. is a good deal flatter than the 270 Win.