I think the last few years of production of the 700 were chambered for 2 3/4" cartridges. An uncle of mine used to buy "Guns review" magazine i am sure some of you will remember, and passed them to me when he was finished. I vaguely remember adverts for the ph 700 and by then (early 80's) they were chambered in 2 3/4".

What makes me laugh now is modern clay and some game cartridges are going to 24gram/7/8 oz loads. If you open a cartridge, the thing is made up mostly of a silly long wad. They would be much better going back to a 2 1/2" case.