"Bullets of .333" are outdated and hard to find."
Woodleigh and at least ?one other company? make them. Just like shooting any other "old" calibre.

25 - 30 years ago, ammo for all the old English guns / calibres was hard to find until Woodleigh, Bell et al started making components. You had to buy what you could find at auction etc and have it sent out to Australia. (this was not me but was what some friends used to do).

I do agree with you though, suggest going with one of the modern equivalents.....
and leave the 333's to Corbin and I !!!!!

(Well, Corbin since I have mine !!!)