Barrels and chambers Flashcards
1
Q
what is the chamber
A
the area the cartridge sits in
2
Q
what is the barrel
A
the area the bullet sits in
3
Q
what is twist rate
A
the number of revolutions per barrel length eg. 1:10 = 1 twist in 10 inches of barrel length
4
Q
twist rate calculation
A
L = C/ tan (theta)
will need to convert L from m to in => 1m= 39.37 in
5
Q
what is a land
A
a land is the raised area of barrel= sunken area of bullet
6
Q
what is a groove
A
the sunken area of barrel = raised area on bullet
7
Q
4 ways to create rifling
A
- Broach cut
- Electrochemical etching
- Hammer forged
- Button formed
8
Q
what is caliber?
A
diameter of projectile
9
Q
what is chambering?
A
length of the cartridge
10
Q
what is the headstamp?
A
markings on bottom of the cartridge case. design of firearm etc
