.270 overkill?
Nah -- overkill. Velocity is too high, too much meat damage for my taste.
To avoid meat damage, avoid shooting the animal in the meat. Placement, as they say, is everything.......
That and a bullet soft enough not to penetate too much on the close shots, yet having enough energy to mushroom on the long shots...... I like Sierra's 150gr Game Kings out of my .270 WIN, started @2900 f/sec.
Lungs are not edible (at least not by me) and are a large target, and deer don't go far when hit there.
As for a Partition, the worst I ever messed a deer up was with a pair of Nosler Partitions ...... out of a a .30/30, no less. A 170 grain Partition launched at 2200 f/sec will at 50 yards, go in a deer's shoulder and go out his far side ham, as well.......
Let's see now -- if my brother can take down 3 javelina with 3 shots using a .308 Win with 150 gr pointy bullets at around 2600 fps at 300+ yards (which he did), then it should be pretty similar to using a .30-30 with 160 gr pointy bullets at around 2250 fps. If he can reliably hit javalina at that range with the one, you can likewise hit deer at that range with the other.
The FTX isn't magic ....it is a pointed bullet that can be loaded in a tube magazine. While it does have better BC than a 150 round nose, it starts slower (unless you are using Hornady's magic Superformance Ammo and a 24 inch barrel) .... it's still dropping a foot from a 100 yard zero, still taking 4 tenths of a second to reach 300 yards and still drifting more than a foot in a 10mph crosswind...... while it may be the best bullet for longer range for the 30/30, it still does not make the 30/30 a 300 yard deer gun.
I looked into loading the FTX for my daughter's 30/30 ..... I concluded that it would turn a 200 yard gun into a 250 yard gun. I could not justify the cost.