It depends on the load
A 44 magnum is just the new and improved version of the 44 special which the special is a 44 caliber. Magnum just means bigger so the 44 magnum is pretty much in between 44 and 45 cal. However, if you mean size, .45 is slightly larger in diamater than .44.
The longer case of the .44 Magnum holds more powder, and, even though the .44 is smaller in diameter, it tends to pack a heavier projectile, ranging from 240 to 350 grains, vs. the typical 165 to 235 grain projectiles used by the .45 ACP.
A 44 magnum is more powerful than a 45calibur
No.
It depends on what you mean by bigger, but the answer to the question you're probably asking is yes. A .45 caliber bullet is .45 of an inch in diameter. A .44 caliber is .44 of an inch, so it's slightly smaller in diameter. However, .44 caliber bullets are many times longer and heavier. A common weight for .45s is 200 or 220 grain, and for .44s it's usually 240 grains.
yes
No. There was a 45
trade it in for a 45 caliber
As far as self defense handguns go, the .45 ACP is an extremely powerful and effective caliber, with a proven military track-record.
Dan Conners wore number 45 when he played for the Miami Hurricanes.
In most circumstances, no. The bullet is too large to chamber in the handgun.