The only reason you would ever use full metal jacket is if you're gun did not reliably cycle jacketed hollow points or as a cost saving measure for practice.
I have seen 357 magnum rounds that didn't open up which is essentially a full metal jacket blow through a Whitetail deer. It's effect was lousy. The bullet had total pass-through of course but the deer look like it hadnt even been shot and ran for over a mile without recovery. On the other hand I have seen a 10 mm 180 grain hollow point traveling at approximately 1080fps kill a deer in under 30 yards with total expansion.
If you do have a gun can't reliably cycle hollowpoint ammunition, I suggest you find a better gun.
"I'm a good guy with a gun" What do I care if I give up some freedom or rights?....The Goverment will take care of me. This kind of thinking is now in the majority and it should concern you.
"Ask not what you can do for your country, but what free entitlements you can bleed from your country"