Neck clearance issue

[TackDriv3r]

6BR Lapua brass out of the new blue box was prepped, loaded and measured. The loaded round neck measures .270 whilst the chamber neck is .271, so that leaves .001 thou clearance. After firing, the bullet does not drop through the fired cases, it feels snug. No hard bolt lift or pressure. Should I turn the necks .002" or .003" ?

If neck turning, do I full size, bumping the shoulders .002" back before neck turning?

 

[jcm24m]

Expand the necks and turn the necks .001” or .0015” . That’s the clearance I like. Then anneal and resize.

 

[JEFFPPC]

Good advice above. Then after they are fired 4 or 5 times recut the necks. Brass flows causing additional length AND additional thickness. Especially early in their life.

 

[TackDriv3r]

Expand the necks and turn the necks .001” or .0015” . That’s the clearance I like. Then anneal and resize.

Rule of thumb, and the way you like it, would that be .002" clearance?

Good advice above. Then after they are fired 4 or 5 times recut the necks. Brass flows causing additional length AND additional thickness. Especially early in their life.

Yes, that is true.

 

[D Coots]

6BR Lapua brass out of the new blue box was prepped, loaded and measured. The loaded round neck measures .270 whilst the chamber neck is .271, so that leaves .001 thou clearance. After firing, the bullet does not drop through the fired cases, it feels snug. No hard bolt lift or pressure. Should I turn the necks .002" or .003" ?

If neck turning, do I full size, bumping the shoulders .002" back before neck turning?

.001 total is only .0005 on each side.

 

[joshb]

Just another opinion but I like 3-4 thou clearance.
Full length size, then expand and turn. Your brass may not have fully expanded to your chamber so bumping back may not be needed.

 

[Bill Norris]

At bare minimum u need .002 clearance so at least do a slight clean up on the necks with the turner.