Author: britrifles
Subject: Case Neck Concentricity
Posted: June 08 2023 at 4:08pm
These bullets are seated to a COL of 3.05 inches for reliable magazine loading and are a whopping 0.5 inches from the lands. The barrel of my Long Branch shooter has a lot of rounds thru it, perhaps approaching 10,000. The throat is obliterated, but the rifle still shoots very accurately for my purposes.
Subject: Case Neck Concentricity
Posted: June 08 2023 at 4:08pm
These bullets are seated to a COL of 3.05 inches for reliable magazine loading and are a whopping 0.5 inches from the lands. The barrel of my Long Branch shooter has a lot of rounds thru it, perhaps approaching 10,000. The throat is obliterated, but the rifle still shoots very accurately for my purposes.
I think the only reason that the partial length resized cases can even be chambered is that the die reduced the case body diameter near the shoulder by a lot, and the bullet will somewhat self align in the bore. But, I’ve always had best accuracy when neck sizing only with the Lee Collet die, and now I know why that is. The collet die will not move the neck centerline position, it squeezes the neck onto a mandrel with no subsequent expansion of the neck as it is drawn out of the case.