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More Ballistic Coefficients! HAM Adds More Airgun BCs To Its Database

Hard Air Magazine already had the largest database of airgun BCs. But now we’ve added the results from more pellets…

In total, the Hard Air Magazine airgun BC database now has 111 airgun BCs. These are made up as follows:

.177 caliber – 49 BCs

.22 caliber – 52 BCs

.25 caliber – 8 BCs

.30 caliber – 2 BCs

This latest batch of tests included more pellets from H&N and Crosman.

You can find our complete database of airgun BCs from this link.

The importance of the Hard Air Magazine Ballistic Coefficient data its consistency. We’ve taken considerable efforts to make the data for the airgun BCs we generate as consistent as possible.

This means that you can compare one Ballistic Coefficient to another from the Hard Air Magazine database. This is not possible where airgun BCs are generated from multiple sources – as in other collections of Ballistic Coefficient data.

More Ballistic Coefficients! HAM Adds More Airgun BCs To Its Database

To achieve this consistency, we always shoot with the same FX Impact air rifle. As well as being a high quality airgun, the Impact is regulated. So it meters a very consistent amount of air to propel each pellet. This contributes greatly to the accuracy of the HAM data.

Another benefit of the FX Impact is that it can readily be configured for multiple calibers. This enables the HAM Team to determine airgun BCs using just one gun for .177 cal, .22 caliber, .25 cal. and .30 caliber pellets. Again, this reduces variables and makes the HAM data more reliable.

To further reduce variables, we use a Labradar Doppler radar system. This allows us to measure pellet velocities at multiple different ranges from one instrument, again maximizing consistency of our airgun BCs.

More Ballistic Coefficients! HAM Adds More Airgun BCs To Its Database

Ten pellets of each type are shot for the HAM Ballistic Coefficient calculations. We then use the average of these velocities to determine the pellet’s BC.

As Ballistic Coefficients vary with velocity, the HAM database of airgun BCs also includes the Muzzle Velocity FPS and the velocity at 30 yards. This provides further validation of our BC data.

Note that in HAM testing, we have found that the FPS of individual pellets varies very significantly beyond about 30 yards. This means that BCs generated at ranges beyond 30 yards are likely to be less accurate. It’s also why we generate the HAM airgun BCs using the pellet velocities at the muzzle and at 30 yards.

To find out more about how the HAM team generates airgun pellet BCs, check out this link.

I hope that you find this data useful!