On firing, the propellant used in the cartridge ignites and the resulting energy is channelled forward to the shot charge.
Often overlooked in this process is the wad, which sits between the propellant and shot charge to transfer the energy.
It is vital that the wad is precision cut to fit the cartridge exactly. As seen from the independent research carried out by Measurement Solutions, today’s most commonly used fibre wads tend to be slightly oval and are more likely to misshape further on firing.
Furthermore, the difference in roundness between the top and the bottom of the wad varies enormously. As a result, propellant gases escape around the wad and this subjects the shot charge to turbulence.
This escape of gas will be different each time, resulting in a loss of certainty when planning and taking your shot. The difference may be a small, but in a sport where small percentages count, this can measurably degrade your competitive edge.