Re: Borden bumps.
Do you feel the chrome thickness would be controlable? Machineable if it was too thick?
I'm not sure plating a section at the rear would be thick enough, this would be a better alternative than soldered/epoxied on bushings if it was, or you could build it up with several treatments.
Still I think, the bumps would be better than a tight tolerance full circle build up.
Fluting the bolt in this area in the right places, then plating it is an idea, if you can control the plating thickness and get it thick enough. Nickel or chrome, that would be nice and hard. Flashy though.
I breifly read that PS article, one in the rag mags on bushings here recently too. I don't see how one could claim .25 MOA increase in accuracy with such a mod, who knows, it just don't add up to me tho. They did say they did it with "two" rifles (3/4" to 1" rifle down to a 1/2" rifle), no other things done. Well, they also said they only guarantee 3 shot 3/8" groups heavier recoiling hunting chamberings, that's with ALL the accurizing they do to them. It seems they don't have that much faith in their findings that "it" alone adds that much accuracy, or they attribute it to "most" of the improvement in the total accuracy job... I don't particularly like the way they cut the receiver threads either.
Bushing it, or what ever certainly can't hurt accuracy and that's the only reason I'd do it. There's a better way than bushings IMHO though. I never was too impressed with the design, or putting them in the front. Ya never know though...