I recently came into a bunch of 8" V-groove pine boards that I'm going to be putting up in my shop. The walls are typical framed wall construction 2 x 4 16" on center. My plan was to run the pine boards horizontally and nail to the studs, my question is what size finish nailer should I use?

I have read on here and other boards that with an 8" wide board I should face nail as just nailing it on v-groove may not have enough holding power. So I was thinking a 15 Gauge or 16 Gauge finish nailer, can anyone offer any advice?

Thanks,
Dave