I have four of the bolts which I bored out then had them honed by a guy to my final sizes..732,730,729 and 728. I turned the push ram at .725.By using a grade 8 or CAT bolt wall thickness is not a problem and when screwed into a RCBS Big Max press the walls are well suported.Lets remeber that we are swaging lead.I machine a lead into the bolt head so the bullet centres in the die.
The reason I have had to go through this exercise of swaging bullets is that I don't own a paradox.I have a A.Hollis with invisable rifling or Lancasters patent oval bore.I have had to do a lot of swaging ,load development and casting of various lead tin ratios to get the rifle shooting,not to mention wads.powder and bullet lubes.Without a large lube cookie the barrels lead up quickly and the invisible becomes very visible I cast two bullets both are CBE moulds.one is a traditional Fosbery bullet and the other is a bluff nose ,both are hollowpoint and weigh 750 gr subject to lead tin mix and measure 735 & 734

good shooting
sbs470