I've for over 35yrs had much better luck with the Sierra's than the Hornady's. The only Sierra's that I've not had superlative success with is the 170gr .30/30 Flat-nose bullets. These seemed to be too hard for the velocities I was using them at. I've never had a Sierra exhibit a core-seperation. Even the BTSpt GameKings. I had a 150gr GK from my .30/06 at 3,100fps (measured) hit a 150lb buck in the neck facing me. It broke the neck in two places and traveled the length of the spine and lodged against the pelvis. It was perfectly mushroomed. and had turned "backwards" like a badmitten shuttle cock, and weighed 127gr. The taxidermist wanted to know "what kind of load did you use in your .300 magnum- I found a dime sized piece of bullet jacket under the deers "chin" "! I replied, It was a .30/06. He dosen't reload, but has since that day in 1983 used Federal Premium's with the Sierra BT GameKings.
Besides that, I've always gotten best accuracy with Sierra's and Noslers. I think that's why Sierra has only offered plastic tip bullets in the varmint bullet lines., and dosen't offer so called "bonded" bullets. I keep asking myself why I buy anything besides Sierras. Now that the Remington CorLokts cost as much or more than the Sierras, I'll probably not ever buy anything else except maybe some Nosler Partitions.
My favorite bullet in the .270 is the flatbased ProHunter 130gr. Usually better accuracy than the BT under 300yds. Also, I really, really like the 125gr FNHP in the .30/30. Took a 200lb pig with one in '04 and got complete penetration on an angling heart/lung shot. Penetrated the so-called gristle plate like it was just ballistic gelatin..... and kept on going! Use them with confidence. They're the "gold standard" by which all other cup and core bullets are measured by. With muzzle velocities under 3,000fps, you'll never be dissapointed. I've not been.