Don't own a .270 but have used a .243 and a .308, always used factory loaded Remington Core-Lokt, not sure its made anymore since
Remington went under.
Never had a problem with it, the deer never went more than a few yards if I did my part, not sure it really makes a difference as
long as you use good modern designed ammunition.
I switched my deer rifle over to a 270 last year. Shot three deer at distances from 50-150 yards and all three dropped in their tracks with core lokt 130 grain.
If I was going to shoot a 270 I would shoot Hornady American Whitetail, it's available in 130 grain and 140 grain and cost just over $20. This is actually Hornady's old custom ammo they just changed the packaging. I shoot it in my 7mm, my oldest son shoots it in 7mm, 270, and 308 and my youngest son shoots it in 350 legend and 6.5 Creedmoor. I shoot it in several other calibers also it shoots under 1 inch groups in every gun we have shot it in and it has very good performance on deer in the above calibers.
My wife and both shoot Coreloks in our 270 and 308. Both deer had to be tracked with little or no blood trail 100 yards away. Small exit wounds. Maybe it’s just us, but I accuse my wife of shooting blood less bullets. I want to try something else.