There are lots of 6.8 SPC mags that might work, in theory but the few YouTubers are using 350 Legend mags in their vids. No idea why.
I’d like to see the Win 215 bullet available as a component but I’m sure it’s too long to try in 10mm. I’d likely use very heavy bullets that I cast in 400 Legend loads. I already throw the RCBS 205 grainer in pistol loads and look forward to 300+ grain moulds. Maybe some of the BPCR moulds would work, but I haven’t looked.
The whole project is just for S&Gs anyway. It’s unlikely that I’ll point it at anything bigger than an unlucky coyote out the truck window.
Mark