Hi Dennis, General Compatibility
6.5 Grendel and 6.8 SPC magazines are generally interchangeable.
Both types of magazines can function with each other's cartridges, but there are important considerations regarding reliability and performance.
Specifics of Interchangeability
Follower Differences: The followers in the magazines may differ slightly in design, which can affect feeding reliability. For example, the front legs of the 6.5 Grendel followers are cut shorter than those of the 6.8 SPC.
Capacity Issues: While both magazine types can hold similar amounts of ammunition, using a 6.8 SPC magazine for 6.5 Grendel may lead to occasional misfeeds, especially when fully loaded.
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Conclusion
While 6.5 Grendel and 6.8 SPC magazines can be used interchangeably, it is advisable to use dedicated magazines for each caliber to ensure optimal performance and reliability.
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Stay safe & have a great day!

No, they aren’t interchangeable.

Good evening to you!! No, 6.5 Grendel and 6.8 SPC magazines are not fully interchangeable and can have reliability issues when swapped. While both calibers fit in a standard AR-15 magazine (STANAG), the differing cartridge geometry and follower designs can lead to feeding problems, especially with full magazines. It is best to use dedicated magazines for each caliber to ensure optimal performance. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸 🇺🇸

No, 6.5 Grendel and 6.8 SPC magazines are not interchangeable because, while both cartridges fit in a standard AR-15 magazine, they are designed for different bolts and have different bullet dimensions.

Hi Donnie and welcome. No, been there, tried that. 6.5 Grendel and 6.8 SPC magazines are not directly interchangeable, although both cartridges can fit in standard AR-15 magazines. The different bullet diameters and cartridge geometries mean that while they might technically fit, they can cause reliability issues, so it is best to use magazines specifically made for the cartridge you are shooting. Cheers and stay safe!