Raimey,
Off the "top of my head", the 22WCF/5.6x35R/ 22 Hornet case head is about .298" in diameter, whereas the 25-20/32-20/.218 Bee is about .354" at the head. It is likely that VV 3N37 would be useful in the 5.6x35R Vierling. I like Lil Gun, but Unique, 2400, H110, and 296 would also. For cast bullet reduced loads, Bullseye should be useful. I'll bet your boys get a kick out of that 25-20, now that the schools are shut down.
Mike

Last edited by Der Ami; 04/15/20 10:43 AM. Reason: correct head size