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You can now also calculate the bullet trajectory for any of your loads. Once a load like this one fulfills the following criteria, you will see the feature as indicated in the image on the right / below:

  • there is a weapon associated with the load,

  • the weapon has a value for sight height,

  • the load has a recorded muzzle velocity,

  • the load is rated ("thumbs up or down"),

  • we have a ballistic coefficient for the bullet.

loadpagetrajectory2.jpg

Load shared by community member:

8.5 x 55 Blaser + .338 | 160gr | Barnes TTSX BT + Norma 203B

Weapon

Author

9/4/25

Rating by author: 

Click to rate this load's performance:

Caliber

8.5 x 55 Blaser

Case Capacity (GoW)

77

Case Length 

2.15'' | 54.6 mm

Cartridge Length / C.O.L.

<< locked >>

Powder

203B

Norma 203B

Powder Charge

<< locked >>

Primer

Large Rifle (LR)

Bullet

.338 | 160gr | Barnes TTSX BT

.338 | 160gr | Barnes TTSX BT

Bullet Weight

160 gr | 10.4 g

Bullet Length (Inch)

1.219" | 31.0 mm

.338 | 160gr | Barnes TTSX BT

Brass / Cartridge

​

Velocity

2943 fps | 897 m/s

Shooting results / spread

'' | 25.4 mm

Shared

no - not shared

Entry generated from Loads Page - Caliber: 8.5 x 55 Blaser, Bullet: .338 | 160gr | Barnes TTSX BT, Primer Size: Large Rifle (LR), Suitable Twist Rates: 62366 psi | 4300 bar - Norma 203B, Comment: FR | maxP | % | v | z: 97% | 47326 | 76% | 2943 | 96%

  • (For printing out and taking notes on range)

    Temperature:
    Wind:
    Distance:
    Notes:

    Shot #
    FPS | m/s
    Shot #
    FPS | m/s
    01
    06
    02
    07
    03
    08
    04
    09
    05
    10

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    Community Load Weapon
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    Barrel Length

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    Barrel Twist Rate

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    Sight Height

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Calculate Trajectory

BETA-Feature: Calculate Trajectory

Loading_icon.gif
Variable
Value
Distance
Velocity
Energy
Drop
Drop MOA
Windage
Windage MOA
Time (s)

Bullet BC G1: Ballistic coefficient used with G1 drag model to describe how a projectile decelerates due to air resistance. 

Sight Height: Line of sight above the center of the barrel muzzle.

Temperature: Assumed temperature for trajectory calculation. Lower tempertures result in higher air density and a slightly larger drag and vice versa.

Humidity: Assumed humidity for trajectory calculation. Higher humidity result in more water particles and a slightly larger drag and vice versa.

Altitude: Assued altitude for trajectory calculation. Higher altitude results in lower air density and a slightly lower drag and vice versa.

OZD: Optimum Zeroing Distance or Most Favorable Zero Range refers to the distance at which a rifle is sighted in so that the bullet's trajectory remains within a defined vertical margin — typically ±4 cm / ±1.75 ''  — from the line of sight over a certain range. This means:

  • The shooter can aim directly at the target up to the GEE without adjusting the scope or holdover.

  • Within this range, the bullet stays inside the vital zone (for example, a deer’s kill zone, approximately 8 cm / 3.5'' high).

OZD Max Height:  Distance at which the max. OZD height is reached and max. OZD height

OZD LoS Crossing1: Distance at which the bullet crosses the line of sight the first time

OZD LoS Crossing2 (OZD): Distance at which the bullet crosses the line of sight the second time. Typically referred to as OZD

OZD Max Distance (OZD): Distance at which the bullet is more than the OZD height below the line of sight

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