Xbox – Bioshock Infinite not loading autosaves

No I'm afraid you can't. There is no such option in any of the menus, not even in the PC version. I searched around a bit, but for this game this isn't an option.

Also, if you read some articles you'll understand why. Just a small excerpt:

The thing is — and this is possibly a spoiler — you’ll use your face-ripping, flesh-melting, eye-pecking weapons and powers to take out white supremacists. That’s game violence put to good use.

The "Vulnerable!" effect means that the enemy is stunned and won't fight back. This effect is triggered by the items in the list below. The numbers are the base duration/alternate fire duration(when present), they can be increased with upgrades or decreased by enemies resistances:

VIGORS:

• Shock Jockey: 3 seconds/4 seconds (doubles the damage received by the enemies);
• Bucking Bronco: 3 seconds/6 seconds (increases the damage received by the enemies);
• Murder of Crows: 4 seconds/9 seconds;
• Undertow: 3 seconds/3 seconds.

EQUIPMENT:

• Electric Touch (hat): 50% chance, 3 seconds;
• Shock Jacket (shirt): 50% chance, 2 seconds;
• Electric Punch (hat): 70% chance, 4 seconds (season pass preorder bonus).