Hi,
Just checked my rifle and there seems to be 6-8 thou of headspace.
Is this normal?

I checked the base to front edge dimension of my brass (headspace), (Norma and Remington)and they measure 0.220.

If I seat a primer high (Protruding by 8 thou) the action will close and no change occurs to the protruding primer.
If I leave the primer 10 thou high the action will not close, is 8 Thou too much headspace?

Can I over come this by fireforming and then adjusting the FLS die to use the shoulder as the headspace determining surface for future reloads.

The rifle will not be used for dangerous game, so a slightly tight case will not be a danger from the critter

The 375 headspaces on the belt !! Primer protrusion has no part in it .The other problem of primer protrusion is it invites misfires .If the primer is not seated all the way the firing pin strike is partially absorbed by the energy needed to seat the primer and less left to fire ! Seating the primer all the way squeezes and sensitizes the primer compound for better ignition.

My guess is your ok. You can control how much you bump the shoulder back. This method has caused problems for one reloader. Case separations. See SAAMI > http://www.saami.org/PubResour...20HandH%20Magnum.pdf

6 to 8 thou is great....after you fire them just bump them a couple and forget the belt!

Thanks Ted Thorn, I thought it might be the case, the is the first belted magnum case I've owned.

I will most likely go with seating the projectiles out far enough on first firing to hold the case firmly against the breach block with a suitably reduced load, and after fireforming use the shoulder to headspace.
Rifle will be used mainly for culling camels, so there is no problem if an occasional case is slightly tight to chamber

Just push the shoulder .003 or .004 back and your brass will last a lot longer to boot.

Measure the fired then formed brass from the C/L datum of the shoulder to the head with a "thingy"