Deer aren't all that hard to kill.
Most every 130 grain bullet that is loaded by Remington, Winchester, Federal, Hornady etc. is designed with deer sized game in mind.
That being said, try several different brands of 130 grain factory loads and shoot the one your rifle likes best.
Where did you find a 20" barrelled .270, if you don't mind my asking?
Best of luck
Rummer