What is ogive on a bullet?
What is ogive on a bullet?
But what is an ogive profile? Simply defined, it’s the curved portion of a bullet forward of the bearing surface. Because a flat cylinder is undesirable for exterior ballistic reasons, rifle bullets have on of three ogives or “point profiles”: flat nose (FN), round nose (RN) or pointed (spitzer).
What is CBTO in reloading?
CBTO (Cartridge Base To Ogive) is the measurement of a cartridge from the ogive of the bullet to the base of the cartridge length. This measurement is used when you are doing bullet seating depth testing: https://bergerbullets.com/vld-making-shoot/
What is a secant ogive?
A secant ogive is an ogive that tapers more gradually relative to its length than does the tangent ogive and touches the curve at two places, which provides a higher Ballistic Coefficient (BC) and less drag.
What is the purpose of an ogive?
An ogive graph is a plot used in statistics to show cumulative frequencies. It allows us to quickly estimate the number of observations that are less than or equal to a particular value.
How important is bullet seating depth?
Bullet seating depth is critical. You probably already know that a particular combination of primer, powder and bullet can significantly change accuracy in any rifle. The distance from your bullet’s bearing surface to your barrel’s rifling usually contributes more to accuracy than do powder and primer combinations.
How long is an AR 15 overall?
The AR-556 has a barrel length of just 10.5 inches and an overall length of 25.3 to 27.9 inches.
What is the coal of a bullet?
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 is a Stoney Point gauge?
Gauge is a precise bullet seating depth: one of the best-kept secrets to accurate reloading. Precisely regulating the bullet seating depth and the resulting “jump” to the rifling is widely regarded as fundamental to improved accuracy.
What is the difference between secant and tangent ogive?
A Tangent Ogive (like our standard BTs) is less sensitive to seating depth but has more drag and a lower BC than a Secant Ogive of the same length. A Secant Ogive (like our standard VLDS) has a higher BC and lower drag than a traditional Tangent Ogive but can be quite sensitive to seating depth.
Is Secant line the same as tangent?
A secant line is a straight line joining two points on a function. A tangent line is a straight line that touches a function at only one point. (See above.) The tangent line represents the instantaneous rate of change of the function at that one point.
How do you determine bullet seating depth?
Before experimenting with bullet seating depth, you need to determine the cartridge overall length (OAL), where a bullet’s ogive contacts the rifling. Several methods can be used to establish this OAL. One method is to make up a cartridge with a bullet seated obviously long in a sized case with no primer or powder.
What calibers does the accuracy one seating depth comparator measure?
The Accuracy One Seating Depth Comparator is compatible with a wide array of cartridges from 22 caliber to 30. In the interest of giving repeatable measurements and making our tool as universal as possible, the seats that contact the bullet and shoulder are radiused.
What is the seating depth of a 223 Remington rifle?
These.223 Remington cartridges have various bullet seating depths with Berger 50-grain Match bullets. From the left, 2.300, 2.970, 2.260, 2.200 and 2.175 inches OAL.
How is the seating depth of a cartridge determined?
Seating depth for a particular cartridge is determined by a number of factors. In the reloading data section, you will find the seating depth we used for a given bullet in the cartridge in question. Please understand that in most instances this length is only a guide, and that your seating depth may be different.
