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Eagle Eye Precision Match Ammunition – Maximized For Long Range Ballistic Performance
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Maximizing Long Range Ballistic Performance

Maximizing Long Range Ballistic Performance

Eagle Eye Precision Match Ammunition – Maximized For Long Range Ballistic Performance

308 Win 175gr Range Shooting with JP LRP-07 and Eagle Eye Ammo

 

There is a lot more to Eagle Eye Precision MatchTM Ammunition than just shooting small groups on paper at 100 yards. When focus on engineering a synergistic package between case design, propellant blends and optimal bullet design to maximize long range ballistic performance. Focusing on the overall ballistic package for long range precision results in lower velocity standard deviations, flatter trajectory and reduced wind drift. This results in more rounds on target at longer ranges and more X’s in competition.

Obtaining the flattest trajectory and minimizing wind drift is achieved by looking at the entire ballistic package. There is a tradeoff and interaction between bullet mass, bullet ballistic coefficient, case capacity and velocity. On one hand, a lighter weight bullet requires less energy to accelerate so it can be pushed faster. The result is that the amount of time gravity and wind are imparting a force on the bullet is less; thus reducing drop and wind drift. In the same way it takes more energy to accelerate a heavier bullet, it also takes more force for the wind to push a heavier or higher BC bullet; thus in its own way reducing drift. An additional consideration is that heavier higher BC bullets on average tend to be longer and therefor reduce case capacity. With reduced case capacity less propellant can be used to accelerate the bullet also reducing peak velocities.

From the perspective of a higher BC bullet the question is whether the increase in BC is high enough to compensate for the loss in velocity. Conversely, from the perspective of a lighter faster bullet, the question is whether the bullet can be accurately pushed fast enough to overcome the reduction in BC. Again, it is important to emphasize that the first priority is ensuring accuracy and low velocity standard deviations. There is no point in having a very fast cartridge if the group sizes are abysmal and the velocity standard deviations are into the double digit range. Not being able to hit a target resulting from poor accuracy or not being able to consistently replicate trajectories resulting from high velocity standard deviations make cartridges nearly useless for long range applications. Finding the optimal solution is generally not the fastest a bullet can be physically propelled or the highest BC but some combination of the two.

To illustrate the tradeoff and maximization of overall ballistic performance we will look at our 6.5 Creedmoor cartridge compared to other common factory and hand loadings. For reference, the 260 Remington provides nearly identical ballistic performance. First, the hybrid geometry of our 130gr bullet makes it very insensitive to seating depth resulting in excellent performance in a wide variety of rifles with various chamber reamer specs. Our 130gr bullet has a .295 G7 BC which is slightly higher than the ~.288 of many other 130gr bullets. Compared to other common factory loads with 140gr bullets, our 130gr cartridge is typically over 200 fps faster. Compared to a stout hand load using a 140gr class of projectile our 130gr projectiles can be accurately run in excess of 100fps faster than common hand loads using 140+gr projectiles.

 

6.5 Creedmoor Ballistic Trajectory Comparison

 

(Drop / Path & Drift Mil’s / Inches)

 

Distance (Yards)

Drop / Path (mil/in)

Drift (mil/in)

Eagle Eye Precision Match 130gr Hybrid

(.295 G7 @2960fps)

Factory 6.5 Creedmoor 140gr

(.315 G7 @ 2750fps)

Hand load Berger 140 Hybrid

(.311 G7 @2850fps)

Factory 6mm Creedmoor 105gr

(.27 G7 @ 3000)

200 Yards

+0.2 mil / -1.8 in

+0.3 mil / -1.83 in

+0.3 mil / -2.5

+0.3 mil / -1.9

+0.3 mil / -2.1 in

+0.3 mil / -1.82 in

+0.2 mil / -1.7 in

+0.3 mil / -1.99 in

400 Yards

+1.4 mil / -20.6 in

+0.6 mil / -7.48 in

+1.7 mil / -24.9

+0.5 mil / -7.75

+1.6 / -22.6

+0.5 / -7.43

+1.4 mil / -20.3 in

+0.6 mil / -8.26

600 Yards

+3.0 mil / -63.9 in

+0.8 mil / -17.63 in

+3.5 mil / -75.3

+0.8 mil / -18.18

+3.2 / -69.2

+0.8 / -17.47

+3.0 mil / -63.9 in

+0.9 mil / -19.59 in

800 Yards

+4.8 mil / -138.1 in

+1.1 mil / -33.04 in

+5.6 mil / -160.7

+1.2 mil / -33.99

+5.1 / -148.2

+1.1 / -32.62

+4.8 mil / -139.5 in

+ 1.3 mil / -36.94 in

1,000 Yards

+7.0 mil / -251.8 in

+1.5 mil / -54.69 in

+8.1 mil / -290.4

+1.6 mil / -56.15

+7.5 / -268.2

+1.5 / -53.83

+7.2 mil / -257.6 in

+1.7 mil / -61.67 in

 

1,500ft Elevation 30.0 Barometric Pressure, 30% humidity, 80 deg F, 10mph 90 deg crosswind

 

The higher velocity combined with an optimized projectile give the Eagle Eye 130gr Hybrid the flattest trajectory among other 6.5 Creedmoor options…and by a significant margin. The Eagle Eye 130gr Hybrid is 1.1 mil or 38.6in flatter than standard factory offerings and a half mil (or more) flatter than top of the line hand loads running within safe SAAMI/CIP pressure limits. Despite the differences in BC and the Eagle Eye 130 Hybrid having a slightly lower BC than the 140gr options there is virtually no difference in wind drift among any of the compared 6.5 Creedmoor loadings.

By optimizing the ballistic package of our ammunition, Eagle Eye Precision Match Ammunition not only highly outperforms other cartridges of the same caliber, Eagle Eye Ammunition often competes with or outperform cartridges that are generally thought have superior ballistics. For example, the Eagle Eye 6.5 Creedmoor 130gr Hybrid has approximately a quarter mil advantage in both drop and wind drift at 1,000 yards than the gold standard factory 6mm Creedmoor load. 

 

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Eagle Eye Precision - 2017