Which type of crimp is associated with greater load consistency according to research?

The star crimp is associated with greater load consistency in ammunition due to its design, which creates a secure and stable seal around the bullet. This crimp type involves indentations that distribute the crimping force evenly across the bullet's circumference, reducing the chances of deformation and ensuring that the bullet remains seated properly during firing. This uniformity contributes to more consistent performance by minimizing variations in bullet seating depth and ensuring that each round behaves similarly when fired.

In contrast to the star crimp, other crimp types may not provide the same level of uniformity. For instance, the roll crimp, while effective in certain applications, can result in uneven pressure points that lead to inconsistencies in load behavior. The flat crimp may also yield less reliable results, particularly if the ammunition experiences varying levels of pressure or environmental conditions. Temporary crimp, as the name suggests, is not designed for permanent securing of the bullet and can lead to instability when firing. Thus, the star crimp is preferred for achieving greater load consistency.