NO
No.
any 45 cal ammo will work in a 45 cal pistol
if it's a revolver......32 cal revolver ammo if it's a pistol......32 cal pistol ammo
gun shows, custom ammo makers
100 USD
It depends on what "best" means to you.
15m
15m
380
You need a gunsmith
I could not find any 380 cal. pistol going back to 1887 ??? are you sure it's not a 38 cal. revolver ???? check writting on top of barrel ......................
Best left to a gunsmith