magnum primer in 7.62x39 resized to 6.5 Grendel

Newbie here. I am just starting to get into reloading. I tried a google search and forum search with no help.

I accidentally bought Remington 9 1/2 M primers instead of the 7 1/2M I needed for reloading 300 blackout.
The only calibers I have, use small rifle primers(.222Rem, .223Rem, .300AAC, and 6.5grendel). I do have a 6.5 Grendel that I wish to reload for and I have access to 7.62x39 brass with large primer pockets. I was curious if the 91/2 magnum primers could be used in the resized 7.62x39 cases to push 6.5 Grendel rounds? Would this combo cause a pressure issue?

You will most likely be fine but start low and work up. You may see pressure signs well below max levels

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