By A Mystery Man Writer
Jackie Schmidt, posting on Benchrest Central, observed that there may have been some production changes with Lapua 220 Russian brass. This brass is commonly used as the parent case for fire-forming 6 PPC cases. The newer 220 Russian brass has slightly thicker neckwalls, and, according to Jackie, the new brass is more consistent in overall neckwall thickness.
220 Russian Brass
6.5mm Grendel - Wikipedia
Neck-Turning with Lathe or Mill
Reloading Cases, Lapua Brass
Reloading Cases, Lapua Brass
Reloading Cases, Lapua Brass
Neck-Turning with Lathe or Mill
220 Russian « Daily Bulletin
220 Russian « Daily Bulletin