.224” 22 CAL 77gr LRX: Designed and optimized for the 224 Valkyrie and its velocity range. The sleek, long bullet requires a 1:7 or faster twist rate. The 22 Creedmoor is another great application for this bullet, however, make sure you have a fast enough twist rate. The SAAMI standard for a 22 Creedmoor is slower- 1:8 twist.