How does a 55 grain .223 round perform in different barrel lengths?

[jumpluff]

The most common barrel lengths for AR15’s are 16 and 20 inches. The Mini-14 has an 18.5 inch barrel length. Is there a reasonably easy way for me to find out how these differences in barrel length affect the performance (velocity and energy) of the common 55gr FMJ projectile?

[ice-nine]

enjoy.

http://www.ammo-oracle.com/body.htm

[ice-nine]

more specifically for M193 and M855

http://www.ammo-oracle.com/body.htm#fragrange

[Tunug]

in theory you want a barrel long enough so that the powder finishes burning just as the bullet leaves the barrel.... any shorter and you lose velocity, any longer and you lose velocity. Less velocity = less momentum = more bullet drop.

generally, the longer the barrel, the flatter the trajectory.

I'd like to know what the max length would be for the .223

anyone?

[ice-nine]

Not sure of the max.

Remington makes a model 700 with a 26" barrel

http://personalsecurityzone.com/cgi-win/order/prodlist.exe/PSZ/?Template=ProdDetail.htm&ProductID=21873