I just put on a McGowen in a 6X284 with an 8 twist and just fire forming loads I was getting. 25-.50 groups with 105 Bergers at 100 yards. I had very little copper fouling.

I posted my rig in the picture post section.

I think you will be happy with your McGowen barrel and keep us posted on how well it shoots.

What bullets do you plan on shooting?