Hornady Superformance .257Roberts 117GR SST 20Rds

Superformance ammunition is 100 to 200 fps faster than conventionalammunition and achieves this performance in every gun without increasesin felt recoil muzzle blast temperature sensitivity fouling or loss ofaccuracy. Superformance uses ultra progressive propellants that take yourfavorite SST or GMX bullets to levels of performance simply unattainablewith conventional propellants. In order to get more velocity in the past shooters have used a brute force approach with large charge weights