I have been speaking to Bruce Bertram this week regarding some odd cases, anyway, he was telling me that he is making .333 diameter projectiles now, they will just be plain cup and core types, but as mentioned previously, more than good enough for most hunting in Australia.
I think they will be about $82-00 per hundred, for both 180 and 250 grain bullets.
His range has expanded considerably lately, making up to .585 diameters now.
Could be another option?

Forgot to add, he does .318 diameters in 180 and 250 grain weights as well, same price.

Re - the twist for the 333, I'd nearly put money on Tony going with a 1~10" twist, JMHO.

Regards,
DC