Forster, Hornady, original RCBS, Lyman aftermarket, and Sinclair lock rings are all cross-bolt style and will work fine in the co-ax. RCBS switched to set screws (steel first, then brass) at some point a long time ago. Lyman includes set screw rings with their dies, but sells the cross-bolt ring separately.
These cross-bolt lock rings lock securely and squarely on the die body, without marring the die threads, and are thicker than set screw types, which works well with the co-ax.
Andy
These cross-bolt lock rings lock securely and squarely on the die body, without marring the die threads, and are thicker than set screw types, which works well with the co-ax.
Andy