--Does this change in law apply only to new manufacture? Or equally to milsurp tracer?
--Will you be making/importing loaded ammo, or just projectile components?
I think that in order for tracer to be more widely accepted by the fish cops, etc., it should be marketed as a safety item for anyone in the bush.
Get lost after dark, break a leg, etc., load and fire 3 tracers straight up and wait for help.
So that suggests all popular hunting calibres.
.223/556, 7.62x39, .308/7.62 NATO,...
.223 and .308 at the very least