Originally Posted by boomtube
"If you have little or no head space it will shoot good even well off the lands."
I'm confused about that observation; headspace is where the cartridge fits. If there's "no head space" we can't chamber the round. ??
I don't think the accuracy if a cartridge is firmly related to where the base of the loaded bullet sits. Seems it's the jump to the lands, concentricity and tuning the charge to the barrel that matters.
Think of it this way, if there is no head space the bolt closes with a little resistance but it is
lined up perfectly/Concentric with the bore if it has been fire formed and turned.
This is the reason I turn the necks before firing. the chamber is very concentric and holds the
bullet centered because of the shoulder wants to center and the bolt holds the cartrige square
(If it is trued).
If you chamber a round that is sized to fit any chamber in a chamber with .002 + head space
the round will lay in the bottom of the chamber and the bullet will not line up with the bore
properly. (Granted it's only a few thousandths) but it does make a difference.
That is the reason most shooters interested in accuracy neck size only after fire forming.
fire formed cases have No headspace and hold the bullet centered even though the neck
diameter is smaller than the chamber to allow the bullet to be released .
If you are not into reloading and will only use factory ammo I would never chamber this
tight because some factory ammo would not fit. also for a new to reloading shooter I
would recomend .001 to .002 headspace to start with and as he gets better he could
neck size only and end up with the best of both worlds.
If all things are right/true in a rifle ,zero head space will produce great accuracy with
lots of freebore because everything is lined up and Centered also brass life is increased
greatly because it dies not have to expand as much stretching the brass upon the
I hope this answered your questions.
J E CUSTOM