Re: Top loading with Surgeon 591 and hinged floorplat?
C1Steve, Terry is correct about needing the proper action, before Surgeon changed to their new website there was a note on the old 591 page saying they were only making 50 actions per year (unless demand was higher) for a BDL 591 that would accept your choice of floorplate, magazine box, magazine spring, and follower setup vs DBM 591 action.
So chances are if you don't order directly from Surgeon (say Brownell's for instance) you will get a 591 set up for DBM bottom metal only (most popular choice). There is enough of a tolerance difference inside the two receivers to cause feeding issues if you want to run a floorplate and spec the wrong action.
Definitely call Surgeon before you buy they are extremely helpful, I checked their new website and they have added a bunch more information to their 591 (R,SS, and WSM) action page to help you pick the right action, but I would still call them.