I am looking for a company that makes reloading presses that will take dies for 4 bore or 8 bore rifles or shotguns

Allen:
Take a look at the he RCBS Ammomaster. http://www.rcbs.com/equipmentframe.html The 50 BMG version has a top plate which can take 1 1/2 inch dies and has more length between the shell holder and top plate. There is a regular size top plate also or the larger hole can be bushed down to the regular size. CH4D could make you a shell holder and dies. They also have a large press. http://www.ch4d.com An alternative would be RCE as some of their bullet swage presses are large enough also. http://www.rceco.com/index.htm Depends how much you want to spend and what other use you might want to make of the press. I think Hornady makes a press like the Ammomaster also. http://www.hornady.com The Old Western Scrounger may still offer their large press which is big enough for some cannon shells. May be others too.