What does OAL mean when reloading?
The overall length (OAL) of an ammunition cartridge is a measurement from the base of the brass shell casing to the tip of the bullet, seated into the brass casing. Cartridge overall length, or “COL”, is important to safe functioning of reloads in firearms.
What does min OAL mean?
As I understand, the minimum OAL is basically where the bullet is seated far enough off the lands that the bullet has a jump and then can cause a pressure spike when it hits the lands.
How does OAL affect pressure?
For the same powder charge, increasing OAL will reduce pressure and velocity (unless you touch the lands, in which case you could cause a pressure spike). For the same powder charge, decreasing OAL will increase pressure and velocity.
What does ogive mean in reloading?
Bullet Ogive – bullet ogive is defined as the “curve of a bullet’s forward section” and can be expressed as a tangent ogive or secant ogive. A bullet with a tangent ogive is one that has the cylindrical surface of the bullet tangent to the curve of the point.
What is OAL in manufacturing?
OAL. OEM (Original Equipment Manufacturer) Adaptation Layer.
What does BC stand for reloading?
BC stands for Ballistic Coefficient Ballistic Coefficient (BC) is a measure of external ballistic performance for bullets. The higher a bullets BC is, the less drop, and wind deflection it will have at all ranges for a given muzzle velocity and environment.
What is bullet concentricity?
The term “concentricity” is derived from “concentric circle”. In simple terms it’s the issue of having the outside of the cartridge in a concentric circle around the center. That goes from case head and center of the flash hole, to the tip of the bullet.
Does coal affect velocity?
Summary of COAL discussion Seating a long bullet to the restrictive SAAMI COAL can severely decrease the internal volume of the cartridge, which will limit the max velocity the cartridge can achieve.
What does CBTO mean in reloading?
Cartridge Base to Ogive
Cartridge Base to Ogive (CBTO) is the measurement from the base of a loaded round to a specific point on the ogive (nose) of a bullet. When loading at home, you generally use a set of calipers and an ogive comparator tool to find what the CBTO would be.
What does coal mean when reloading?
COAL is the cartridge over all length, a vital part of reloading. if the COAL is wrong, pressures can rise to unsafe levels in some instances. Loss of accuracy is another major problem. Determining COAL is about finding the optimum length for hand loads, for your rifle.
What does the OAL mean on a reload manual?
Most reloaders have noticed that reloading manuals show one specific OAL for every different caliber. This OAL dimension shows the industry standard (SAAMI spec.) for a particular cartridge.
Which is the official definition of the word metaphor?
Those are the uses of metaphor, and this is the official definition: A word or phrase for one thing that is used to refer to another thing in order to show or suggest that they are similar An object, activity, or idea that is used as a symbol of something else
What happens when you increase the OAL on a rifle?
When we increase the OAL, we need to work up loads with caution, and expect chamber pressure to increase. Experienced shooters know that this is one essential step to improve rifle accuracy. The optimum length of accurate handloads will almost always be quite a bit longer than factory loads.
What does O.A.L stand for in a Load Manual?
O.A.L stands for Overall Length, while C.O.A.L stands for cartridge overall length. You can find these two used interchangeably in load manuals. Furthermore, your C.O.A.L used in relation to seating depth can drastically change your accuracy, pressure, and velocity.