7mm Remington Magnum

Condition Parameters
ICAO standard atmosphere
Drag function: Spitzer-B
Recoil for this round is 15.68 ft. lbs.

Muzzle Velocity BC Height of sights Angle of departure Atmosphere Rel. Density Temp(°F) Range of Zero (Y)
2947 0.477 1.5 5.695 0.076474 59 250
7mm Remington Magnum case (from Accurate Powders)
My 7mm Remington Magnum is a fine rifle. It is a Browning BBR topped with a Leupold 2.5-8X VXIII scope. The ballistics shown here were generated with 140gr Barnes XLC bullets, Winchester-Western large rifle magnum primers (WLRM), and 65.5 grains of IMR 4831. This round never produced acceptable accuracy for me (2.3" 3-shot group at 100 yds) and so I have abandoned it. While slower, the 160 gr. bullets seem to be the sweet-spot for this rifle.

Note: All velocities were measured using an Oehler model 33 Chronograph. Ballistics were calculated using Ballis-tec software.

Exterior Ballistics

Range(Y) Height Deflection(in.) Velocity(fps) Time of travel(sec.) W1 FP
0 -1.5 0.0 2947 0.000 3.227 2705.005
50 1.0 0.0 2857 0.052 3.128 2542.199
100 2.5 0.0 2771 0.105 3.034 2391.352
150 2.9 0.0 2687 0.160 2.942 2248.470
200 2.1 0.0 2603 0.217 2.850 2109.992
250 0.0 0.0 2520 0.275 2.759 1977.488
300 -3.6 0.0 2437 0.336 2.668 1849.283
350 -8.8 0.0 2354 0.398 2.577 1725.378
400 -15.8 0.0 2272 0.463 2.488 1607.187
450 -24.8 0.0 2191 0.531 2.399 1494.557
500 -35.9 0.0 2110 0.600 2.310 1386.020

Maximum range of projectile in a vaccuum (space) : 17369.62 Y
Retardation of projectile in air : 1379.4628 fs/sec
Pressure (or resistance) on the meplat : 42.8937 lbs.
Calculated Effective Ballistic coefficient : 0.501

Terminal Ballistics
 Optimum Game Weight (OGW): 752 lbs.
Reported sectional density: 0.248
Calculated effective sectional density: 0.248
Forward Momentum rating (FM) : 1.83
Ballistic Efficiency Index of this round out to 500Y = 25.52