710,715,770 are all relatively new (in the past 10 - 15 years I think) and basically a twist on the same action. 798's were imported from Eastern Europe perhaps CZ? They were basically a commercial Mauser action I think. 788 was Remington's no frills multi lug action (9) lugs 3 rows of 3, discontinued sadly some years ago. They had a detachable mag which was the worst part of the rifle because it was right in the carry point,plain jane stock. Otherwise these 788's had a wonderful reputation for accuracy and often were reported to out shoot the top of the line 700's. I'm sure you can find this info on their website as well. Wish I had my 788 back.