I just phoned CamPro Bullets, talked to a gent named Tan, and described exactly what you all are saying.
I then sent him an email quoting people's wants and needs as described in this thread.
He was extremely grateful for the intel!
ht tps://www.campro.ca/index.php?id=1010
If they don't want to produce .315 diameter bullets or don't want to tool up for it, I suggested to them that they produce exposed lead base bullets. Never got a reply.