I'm not a fan of long barreled magnum rifles for hunting the forests of Pennsylvania. But if the 270 MAG is all you have it will work fine if you wait for good shot into the chest organs.
I hunt bears with guys within Mifflin County. Most popular rifle in our group is Remington slide action 30-06. My bear rifle is a Savage lever action in .308 shooting round nose 180 grain bullets.
Good hunting to you.
Fire up the grill! Deer hunting IS NOT catch and release.