This website may help http://www.eskimo.com/~jbm/calculations/traj/traj.html
1-7 barrel tw = -6
1/10
1 in 14
To calculate barrels per inch, you need to know the volume of the barrel in gallons and the dimensions of the barrel in inches. First, convert the barrel volume to cubic inches (1 barrel = 31.5 gallons = 3,785.41 cubic inches). Then, divide the total volume of the barrel by the height of the barrel in inches. The formula is: Barrels per inch = (Volume of the barrel in cubic inches) / (Height of the barrel in inches).
Simple, it it is a true barrel simple find the measurement from inside to inside of your barrel and divide by 2. IF it is not a perfect half circl barrel or true barrel, simple find your chord (measurement inside to inside) and find your rise. Once you have these measurements you can use your diameter formula to figure the radius
1-7 barrel tw = -6
The Browning 2007 Product Catalog states that the A-Boltchambered for 25WSSM with a 22" barrel has a 1 in 10" rate of twist.
I own a London Fine twist double barrel shotgun in fair condition, it was rated at $100.
twist is 1:9
fine twist london
Rifling imparts spin that stabilizes the projectile. The rate or "twist" determines how much
It should be stamped on the barrel
In relation to firearms, it has to do with the rate of rifling in the barrel. Rifling is the spiral grooves that puts a spin on a bullet to increase it's accuracy. "Barrel twist" is the rate of spiraling or inches per turn. That is the length of barrel it takes to spin the bullet a full 360 degrees.
Impossible to answer without knowing the caliber.
optimum combination of input
the rate of twist i probably 9" or 1 in 9" not to sure.
The twist rate in a Winchester 670, 243 caliber is 1:10.