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Why are the drag curves convex nearly immediately if the effects are only significant at longer ranges?

For most projectiles, the effect of the tip beginning to change shape is nearly immediate. From the graph of the drag coefficient (Cd) vs. distance above, you can see that the change in the drag of the projectile starts to happen immediately and accelerates until it stabilizes at about 300 yards. This is for a high ballistic coefficient (BC)... Continue Reading

Categorized in: Heat Shield Technology

Couldn’t limit cycle yaw cause what you are seeing with the drag coefficient at supersonic velocities?

Not with anything other than a grossly under-stabilized projectile. If limit cycle yaw was the root cause of the observed increase in drag short range, we would have seen the same drag signature regardless of tip used. Limit cycle yaw is a phenomenon associated with some projectiles in which, because of their shape and their stability,... Continue Reading

Categorized in: Heat Shield Technology

Would insufficient spin rate cause what you're seeing in the drag behavior of some of these projectiles?

In situations involving extreme lack of gyroscopic stability (Sg), effects similar to what we witnessed could contribute to the effects we observed. Extensive radar testing proves this is not what is occurring. We perform extensive bullet modeling for both mass and aerodynamic properties using state-of-the-art, military-grade software called... Continue Reading

Categorized in: Heat Shield Technology

Would the drop in BC you claim to see be caused by the normal change in BC at lower velocities?

No, it would not. The drop in ballistic coefficient (BC) associated with a bullet flying down range as it slows down is driven by two things. First, it is caused mostly by the drag coefficient (Cd) versus Mach number (drag model) of the standard not being at all like the actual drag coefficient versus Mach number of the projectile that is... Continue Reading

Categorized in: Heat Shield Technology

If the BC degrades with older tip material, how accurate are trajectory predictions?

They become progressively more inaccurate beyond ranges of 300 to 400 yards. The effects of changing ballistic coefficients (BC) with distance can be modeled with several commercially available ballistic calculators, but it is virtually impossible to know what the actual BC changes are without Doppler radar data. Reducing velocity to measure the simulated BC in mid-flight does not reflect the effects of aerodynamic heating on the tip.

Categorized in: Heat Shield Technology

What's the maximum range for acceptable terminal performance with ELD-X bullets?

It depends on retained velocity and is therefore cartridge dependent. In general, the ELD-X bullets will provide reliable and effective terminal performance up to velocities of approximately 1,600 feet per second. Click here for more information on Hornady Heat Shield Technology.

Categorized in: Bullets, Heat Shield Technology

Are you encouraging people to shoot animals at long range?

No, we are simply providing a bullet that is capable of excellent terminal performance, accuracy and reduced wind drift that is lethal at ranges from near and far. It's our opinion that you should get as close to your quarry as possible. In certain instances, you simply shouldn't take the shot.

Categorized in: Heat Shield Technology

If tips melt, why not just shoot targets and animals with non-tipped BTHP bullets?

The new Heat Shield tipped bullets provide both aeroballistic and terminal performance advantages. The class-leading ballistic coefficients provide flatter trajectories, less wind drift and higher impact velocities. The ELD bullets provide terminal performance far superior to traditional bullet designs over a much wider range of velocities.... Continue Reading

Categorized in: Heat Shield Technology

How can you claim such high BCs?

All ballistic coefficients (BCs) were determined using Doppler radar by measuring bullet velocity as a function of distance to ranges of up to one mile. Doppler radar provides velocity measurements roughly every one to two feet of the bullet's flight, resulting in exact measurements of velocity loss due to drag. By using state-of-the-art aeroballistics software (6DOF), large amounts of data can be analyzed and computed to provide extremely accurate determinations of projectile drag.

Categorized in: Heat Shield Technology

Why should I buy your BTHP Match bullets if your tipped bullets are so good?

For match use, many shooters find that one bullet shoots better in their specific rifle than others. BTHP bullets provide another option for match and target shooters to tune loads for the specific application. Click here for more information on Hornady Heat Shield Technology.

Categorized in: Heat Shield Technology