Thread: Neck tension

Originally Posted by veitnamcam

Wouldn't the un sized portion hold the round perfectly concentric(in a tight neck chamber) and the projectile held straight in the bore?

Would also mean effectively a lot less neck tension.

I can see the unsized section working to hold the brass concentric in the chamber, that makes perfect sense to me.

But the 1/4 sized neck (bearing surface) on the case is all that really touches the projectile if the bullet isn't jam seated. its just cantilevered out there in free bore and this could cause issues with concentricity?

You often hear of wild-cats like the 7mm-300WSM when there is already a 7mmWSM, so it seams pointless...but its done to get the longer neck, which aids in concentricity. It comes at a slight cost in capacity (internal capacity is lost by having the longer neck, so its a little slower than the true 7mmWSM), but some consider it important for accuracy.