308 Remington X R 100.?

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Hi, does anyone else shoot a 308 Remington X R 100.?
If so with what results?
What is your best load for this gun? How does it group?
My friend has one also and his loads don't shoot well in mine. But that's no surprise. I wouldn't be that lucky.
I seem to be having pretty good luck with 34 gr 3031
[thats below min.], 168 SMKs with .025 jam.

thanks