XXL Reloading

.3115 | 255gr | Hornady Sub-X

Our reloading data for the .3115 | 255gr | Hornady Sub-X bullet covers a total of 1 suitable calibers and 110 load recipes

The Hornady Sub-X bullet is engineered for subsonic velocities, featuring a progressive design that includes a polymer Flex Tip insert within a long cavity. This allows for reliable expansion at lower speeds, a critical factor when working with subsonic loads. Its construction utilizes a lead core encapsulated by a precision-drawn jacket, ensuring consistent weight retention and enhanced penetration. Expansion is moderate and controlled, maximizing terminal performance while maintaining deep penetration, suitable for medium-sized game. With typical calibers being 300 Blackout and similar, this bullet is optimized for hunters targeting deer and hogs at closer ranges where subsonic ammunition is preferable. The Sub-X's design reduces the sonic crack while still delivering terminal effectiveness, ideal for suppressor use. For handloaders, the bullet's uniform build and the performance-driven design simplify load development, ensuring repeatable results across various load recipes, making it a versatile choice for custom load applications.

About this bullet

.3115 | 255gr | Hornady Sub-X is a bullet made by Hornady. At 255 gr (16.5 g) and a diameter of 0.3115'' (7.91 mm) it suits handloads where bullet weight and barrel length have to be matched carefully. Its G1 ballistic coefficient of 0.365 drives velocity retention and wind drift downrange — higher values mean a flatter trajectory at distance. A twist rate of 1:11.5 is recommended for stable flight; slower twists can under-stabilise this bullet. We currently list 110 load recipes across 1 calibers for this bullet.

Most popular calibers for this bullet

CaliberLoad recipes
7.7 x 58 mm Arisaka110

Load data for .3115 | 255gr | Hornady Sub-X bullet is available in the following calibers:

Safety notes

All load data is reference data only. Always start at the minimum charge and work up in small steps while watching for pressure signs. Never exceed the maximum charge published by the powder or bullet manufacturer.