This is called bullet seater die in old catalogs. With it came a brass "mushroom" seater.

With kind regards,
Jani

P.S.: here is a similar device, complete with the mushroom shaped bullet seater, albeit for muzzleloaders: https://thumbs.worthpoint.com/zoom/...g_1_1922436274a9d01587e4b495a45ecdd0.jpg

Last edited by montenegrin; 04/28/21 04:11 AM.