You shouldn't sell them at all if you don't know who reloaded them. Very dangerous practice to shoot reloads if they are not at least factory reloads.
These sell for about $100 in great condition, and about $40 in poor condition.
it is a little less powerful but not by much
50-500 usd
40
No
the 40 cal is a little bigger then the 357
No, you cannot safely shoot a .45 caliber bullet from a .40 caliber handgun. The .40 caliber handgun is designed specifically for .40 S&W ammunition, which has a different casing size and bullet diameter compared to the .45 caliber. Attempting to use .45 caliber ammunition in a .40 caliber firearm could lead to dangerous malfunctions or serious injury. Always use the correct ammunition specified for your handgun.
40
50-450 usd
50-100 depending on condition
If you mean how heavy is the bullet in a .40 caliber cartridge, the answer is, it ranges from about 150 grains to about 180 grains.
"My pistol is .40 caliber." "We were fortunate to find a manager of his caliber."