Let's discuss some terms. GRAINS used in this context is a measure of weight. The weight will depend on WHICH powder is used, and WHICH weight bullet is used. It may vary from 4.5 grains to 12 grains. For your own safety, NO ONE should ask for load data from an open site such as Wikianswers. For all you can tell, I am 11 years old, and Mom does not know I am on the computer. (I'm not, and she knows) PLEASE obtain load data from the powder and bullet maker sites- trusted data.
40 grains of fffG
There are a lot of variables involved with the number of grains of powder in any given caliber round. Most importantly are the type of powder and the weight of the bullet. After that is the loader's preference as to the velocity of the round. For example, I load a 155 grain .40 caliber bullet using Ramshot Zip powder for a "light" velocity of about 1050 feet per second using 5.3 - 5.4 grains of powder.
A good place to start is with as many grains as the cal. (30 in this case)and work up from there to find the load that gives the best groupings. I shoot 35 gr. for target and 40 for hunting and 45 with a mini ball in my 32's
40-60 grains of black powder. Start at 40 and work up until you see signs of over pressure. Like condition of the cap.
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 opinion is the 45 ACP round has more knock down powder then the 40 caliber
I use 30 grains in my .50 horse pistol, similar to a Queen Ann, it gives a good group at 25 to 40 yards with a patched .495 dia 175 grain ball.
Depends on the caliber. A .45 caliber pistol uses about 40 grains of black powder. Contact the maker's website and download the owner's manual for YOUR gun.
30-40 Krag is a cartridge also called 30 Army. It uses a 30 caliber bullet and 40 grains of smokeless powder.
Depends on who made it.
That is not slang - 40 cal stands for 40 calories, which is a nutrition measurement.
Roughly 40 grains, but it will vary depending on round ball or elongated bullet. We would urge you to contact the manufacturer for an owner's manual for your revolver. Many makers have manuals available on line, or free for the asking from their customer service department.