Justin,

Seyfried briefly touches on chamber ringing in Vol 10, Issue 4. His articles in Vol 5, Issue 4 and Vol 6, Issue 1 provide his techniques/approach for loading NfB loads. As Steve mentioned, Bell did an extensive set of articles on Finding Out for Myself with specifics on NfB loads. These can be found in Vol 15, Issue 1; Vol 15, Issue 4; Vol 16, Issue 1; Vol 19, Issue 3; and Vol 22; Issue 2 (Express Rifle Case Fillers). The issue looks at pressure spikes with the different fillers.

Ken