The .270 Win. likes to be loaded hot. The load I use is over the max in the Lyman manual, but it is proven to be the OCW load. It has already been mentioned here and it was th great Jack O'Conner's pet load. 60 gr. H4831 witha good 130 gr. bullet.
Actually, O'Connor wrote of prefering 62 grains of H4831 (pg. 80,
The Hunting Rifle, 1970). This was two grains over the maximum load published at the time by his buddies at Speer, who listed 60 grains as maximum (pg. 155,
Soeer Manual No 1, 1962). the reason for the discrepancy was discovered after Jack's death, when his reloading equipment ended up in the hands of another gunwriter (IIRC it was Gary Sitton). It was discovered that his powder scale was
incorrectly calibrated, and when he thought he threw 62 grains he actually threw 60. Today Speer lists 58 grains as maximum with the 130-grain bullet, but that powder is different today than it used to be, and modern pressure equipment allows much greater accuracy in measuring alowable pressures.
IME the .270 performs very well when loaded under maximum. I'm not sure where this anthropomorphic characteristic of "likes" first became applied to inanimate
cartridges, but it clearly isn't an absolute. I believe that some .270 rifles are more accurate when loaded close to maximum, but there are certainly others which perform very well loaded well under max.....I've had two myself.