9MM VS .45ACP WHAT ROUND WOULD BE MORE EFFECTIVE TO KILL A BIG ANIMAL LIKE BULL.?

For a bull what? Moose or what? Neither would be great for a charging bull moose or Brahma bull. A young guy with my dad in Montana shot a bull moose in the forehead with a .45acp pistol. The moose dropped like a rock AND got back up and charged him. 9mm and .45 acp are meant for human size animals not big game animals. Granted you can walk up to a big steer and shoot it in the ear with either rounds and it will kill it. But that’s not going to happen when it charging you at 35+ mph. For something like that you need more power. Unless you have a death wish.

I would say .357 magnum or 10mm auto as the minimum. Anything smaller than that….. well better hope there is a tree to climb close to you.

Are you kidding?

In fact I have this very problem, right here, on the farm. We have a herd of buffaloes. Believe me, 'Cows they ain't!' I carry, either, a 45 ACP or a 9mm pistol around with me all day long. If one of those 6 1/2 foot tall, 2,400# bulls should ever decide to go after me, then, whether or not I've got a 45 ACP or a 9mm pistol on my belt ain't going to do me no good at all.

If I can't get up a tree or on top of a rock pile fast enough ........ I'M DEAD!

i'd go with a 9. I'm most accurate with, fastest time between shots.

with a 45 i doubt after the 2nd round i'd hit anything but dirt.

when i rapid-fire my 9, it sounds like i have a sub-gun. and i can get all my rounds on a silhouette target at 7 yards. the only pauses you'd hear is me reloading between magazines. I can dump all 58 rounds into a silhouette target at 7 yards in just a few seconds. don't care how many it takes to finish off a bull, I'd probably pour bullets into the head just to make sure it can't get back up and hurt me.

9mm FMJ, preferably 9mm NATO. A full metal jacketed 9mm loaded to +P will out penetrate any 45 ACP load, and penetration is what you need for a big animal. The reason is sectional density. See the article below for an explanation of SD.

Well I would have to say the .45ACP because I believe they bigger holes are better in these situation. Regardless of +P ammo, barrel lenth, or ammo cap. after a .45acp 1911 stopped a 687Ib. hogs from charging at him, I think I can stop the bull. I would be using either JHP or SJHP but no FMJs.

Other than bull fighting, why are you facing a bull? I mean it's sort of like asking about hammerhead sharks? Since matdors don't carry pistols, I'd say carry a sword instead and stand still. Bulls atack movement rather than color.

well i suppose if i HAD to use one or the other, it would be the .45ACP, but its a stupid choice and question.

a full 7 round mag would probably not stop a charging bull.

I have a answer that is equal to your question

Use a .45/9mm

it is a 45 bullet stuffed into a 9mm casing .

it has the hard hitting power of a 45 with the speed of a 9 mm

Out of your choice .45 ACP out of my choice a .44 magnum or a .357 magnum will do the job well.

Practice and Be safe.

.45 ACP in a heartbeat.

7 (a full M1911 magazine) shots to the face.

But why would a BULL be attacking you!?