The .308 Winchester is a better candidate for this than the "Ought 6". Muzzle blast is still gonna be stout. The faster powders, for caliber, will help with velocity and also the heavier, for caliber, bullets will keep energy levels up. I am thinking like the 178 grain A-Max and IMR 3031. I have a 20" barreled 788 and the Varget/4064 speed powders don't produce good velocities with the 150/155 grain bullets. Accuracy is typically unaffected by shortening the barrel and some claim it gets better depending on the contour. The bore condition seems to be the gage so I would expect similar results. I am with you on lightening up the load on a "Walking Rifle"!
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