For me anything 7mm and smaller gets NF rings and rail. 30cal and up gets Near Mfg. rings and rail.
Used to have a Wby Accumark 338-378 with a NF 5.5-22x56 on top that would not stay put. Went thru 3 different sets of mounts, Warne, Talley, & NF before a member here, Autorotate, steered me onto Near Mfg. After putting the Near Mfg. rail and rings on that NF scope never moved.
Near Mfg. is definitely the best I've ever personally used. Their quality of workmanship is 2nd to none!