Fmjbt?

[Oklahoma Stronghold]

I know FMJ stands for full metal jacket but what does the BT stand for?

 

[aeropb]

boat tail

 

[Oklahoma Stronghold]

What is a boat tail? What's the purpose?

 

[Phat Mike]

makes the bullet more efficient , less drag IIRC

 

[Shadowrider]

 

[aeropb]

the boat tail reduces drag and gives the bullet a higher ballistic coefficient.

 

[JCW355]

Look at the picture on the left of the bullet, see how the bullet tapers? Thats the boat tail part. A regular bullet would be non tapered.

 

[Old Fart]

They got thier name from looking like a boat from above.

 

[MBB]

They got thier name from looking like a boat from above.

And boats look like that because the shape reduces form drag.

The tapered tail reduces the size of the void on the downstream side of the bullet (or boat) and therefore reduces the amount of energy-robbing eddies that form.

 

[338Shooter]

I knew a guy named Eddie when I was a wee lad. He was always wanting me to come outside and play and robbing me of energy....