Choosing the best weapon for self defense is a matter of personal preference.
The .45 ACP is generally considered a very good defense weapon. There are very few handguns that shoot a larger projectile, but bullet size is a trade off with capacity (how many rounds a pistol can hold).
Typically, a .45 ACP pistol holds 7-8 rounds, compared to a 9mm's 14 rounds or more. If one is expecting to be in a prolonged gun fight, one might prefer having more rounds.
No such weapon. You need to see a gunsmith.
NEVER FIRE AMMUNITION IN A WEAPON NOT MARKED, CHAMBERED AND DESIGNED FOR IT. DANGER, DANGER, DANGER, DANGER. Don't do it.
NO. NEVER try to use ammuntion in a weapon not chambered for it.
NEVER SHOOT AMMUNITION IN A WEAPON NOT CHAMBERED FOR IT!!!!! Do not attempt this.
The majority of 1911 models fire the .45 cal ACP. HOWEVER, there are several 1911 variations available, ones that shoot: .22LR, .32, .380 ACP, 9mm, 10mm, 40 S&W and others. On the weapon (typically on the barrel), the metal is stamped with the correct caliber to be used with that particular weapon.
I believe its .40 S&W or .45 ACP. Pros & Cons to both, trade off in ammunition capacity, recoil severity, etc....Comes down to personal preference. FBI is keen on the 40 S&W. Most 40s will have a larger capacity than 45s. Go to a range that rents guns, and see which you prefer. At this point, its about personal preference more so than effectiveness (they both are good defensive rounds).
That is called a ACP Loan
Yes. AR-style rifles can be had in .45 ACP, for example. There was also a .45 ACP variation made of the Uzi Model B (good luck finding one, though). And there are others, as well.
There is no such weapon. 25mm converts to .985 inches. I think you mean a Beretta chambered in 25 ACP (6.35mm) Price would depend on what model you are looking at. They can run from 100-400 USD.
ACP stand for Automatic Colt Pistol
Requires professional appraisal
The caliber of this weapon is .45 ACP, or it's full name is .45 Automatic Colt Pistol.