gotboostvr
Member
Virtually all of them are only a bigger case speced out for higher chamber pressure than others of the same approximate case size and bullet diameter.
Heck, alot of new cartridges are the same as an older chambering but a slightly shorter case and a faster twist rate to utilize the heavier bullets available. The 6.5 CM is just a slightly shortened 260Rem with a fast twist.
See also: 6.8 Western v 270WSM
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