Nothing but make the Vampire even more angry at you.
It makes a hole approximately 50mm in diameter.
Some guns yes, but most guns would require gunsmithing to change caliber.
That would depend on the caliber, the distance you are shootingt and your location.
Many would say the 22 Long Rifle.
That would depend on the caliber, and type of bullet, the rifle uses.
If properly trained, no
.22 caliber rifle.
270
Would need more info on the rifle, caliber, model, condition and images would be nice
It dies.
No, you cannot, and attempting to do such would be extremely dangerous.
They would just get a scar that would never go away
JFK was shot from multiple directions with multiple rifles. It's just physics. Are you asking what caliber rifle Lee Harvey Oswald supposedly shot Kennedy with? That would be a 6.5 mm Carcano Model 91/38 rifle.