Does anyone know the relative rarity of the Type A in .30-06?

I have not tried to keep track but I think I've personally seen (online and at auctions) more in 9.3x62 than .30-06. I would guess there were about as many produced in 6.5 Portuguese, 8x60, and 7x57 as there were in .30-06.

The rarest to me seem to be 8x57, .404. 6.5x54 Mauser, 8x51 Mauser, and .250 Savage. I don't recall ever seeing a Type A in 8x57 and I haven't seen any Mauser rifle of any type in 8x75.