Mr. Linebaugh,
In your article http://www.customsixguns.com/writings/dissolving_the_myth.htm
you talk about the Blackhawk .45 colt chambers being sized too big. "Grossly oversized"
I haven't tried this but was wondering if it would be a good idea to: fire form the case, don't resize the whole case, only resize enough of the neck (however deep your bullet goes into the case)to hold the bullet and give you the neck tension and then crimp? Would this help get more life from the cases and give a better gas seal for hopefully better groups from the guns?

Has anybody else tried this? Results?

Neck sizing will work fine as long as you don't have more than the one gun to shoot the handloads in. Not sure every gun is guilty of large chambers. Fired cases come out of my Bisley at .478 and go in at .473 at the mouth but are .467 midway so if anyting I'd say the sizer is more to blame than the chambers in that instance. Some makes of brass is thinner than others so I think they tend to overcompensate.

This is something I do with a couple of my Rugers...it seems many of their chambers are large

Mine were small and I had them reamed.

Badubet, John was speaking of the chambers, not the throats. The chambers of most Ruger 45s these days are MUCH better than when John wrote that article. There is really no need for custom building a 6 shot 45 anymore. Brass working is not too bad and the throat issue is an easy fix. I haven't seen any that didn't shoot well.

Ah. You are correct Glenn.

Does this process help with accuracy? or no big deal?

From some of the clues in the article it seems to be about 25 years old which is old to some I'm sure, but not so much to me

Okay:
The article talks about the Blackhawk chambers being sized .486-.490

My chambers are .479
and the resized brass is, .4755

Not an issue, actually pretty darn good.