.12 gram bbs.
The CPS is rated at 400 FPS with regular pellets, you can expect about 20% increase in FPS.
450 FPS BB 400 FPS Pellets
Depends on which loading of the cartridge- can be as slow as 2700 fps, or as high as 3700 fps.
750 fps. for BBs, 665 fps. for pellets.
Pellets are faster. BB's top out at around 550 FPS pellets can go a fast as 1,600 FPS (Feet Per Second)
The AR 15 is a rifle, not a caliber. the .223 is a caliber. Usually the AR-15 is made in caliber .223.
FPS is a velocity measurement, not a distance measurement. Without giving exact measurements, 223 feet per second (FPS) would be somewhere in the vicinity of 125 - 128 miles per hour or 201 to 206 kilometers per hour.
It's rated at 645 with pellets and 680 with BB's
The Gamo Hunter Extreme Is rated at 1600 FPS with Gamo PBA Pellets, and 1200 FPS with Lead Pellets. The cost is $485.95 from Pyramyd AIr. However I caution you about using PBA Pellets. They are 5.4 grain compared to a Crosman 7.9 grain pellet, so they are very light. Light pellets have a tendency to wonder off target. You won't find these pellets in any competition shooting. Heaver pellets fly straighter and have more knock down impact. So don't confuse speed with accuracy, they are two different things. There are several other pellet rifles that are rated at 1200 FPS that are cheaper but will also reach 1600 FPS if they use the Gamo PBA Pellets. I suggest you read the reviews on the link below.
the best way to lower the fps on a sniper rifle would be to reduce the type of spring you are using. airsplat.com has a whole bunch to pick from to decide what type of FPS you're looking for.
320 feet per second with .12 pellets. It is best to use .20 pellets in this aeg.
It's rated at 750 FPS by the manufacture (Crosman). That's like asking the mouse to watch the cheese. Manufactures use very light pellets to test their air guns resulting in abnormal FPS reports. Pellets are fired through a Chronograph to measure the speed of the pellet.