Unless you have a ton of .277" bullets on hand, check out the 7mm's, the .280 Rem, 7mm SAUM, 7mm RM, 7x57, and 7mm WSM for that power range. The 7mm/.284" bore does everything the .277" bore does, only better, and with far more options component wise, and better bullets. Plus, you get the versality of bullets from 100 to 180grs.