.223/5.56 magazines will work (somewhat) with 6.5 Grendel and 6.8 SPC. Usually only 3 to 5 rounds can be loaded with more causing misfeeds where more than one cartridge pops out at the same time. There are some exceptions such as my H&K steel 30 round 5.56 magazine that I can load 20 rounds of 6.5 Grendel in. Now the H&K mag runs over $45 so I would recommend a $25 6.5 Grendel dedicated magazine that holds 26 rounds and is the same size as preferrable.
CS Products makes the best 6.5 Grendel and 6.8 SPC magazines. They are apparently the same magazine with different followers and should work fairly well when swapping between cartridges.
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