Rem 6 1/2 vs. sm pistol mags?

[750k2]

Anyone know how these compare?
Have a batch of 6 1/2's from hornet days and thinkin
of burning them up on some 820 that needs a good start.
Thanks

[Rocky Raab]

Pure guess here, but the Rems are probably milder than a small pistol magnum. Can't say for sure because SPM primers vary from brand to brand.

[750k2]

I found this but looking for real world experiences.
http://www.jamescalhoon.com/primers_and_pressure.php