Not sure how long it will take for a latter from Savage Arms, they just moved all the data over to them from the historian, might be a bit.

As for only 410 barrels on switch barrels, no, I know a guy in Maine that has a 30-30 25-35 set that lettered from the historian leaving the plant with the two barrels but both barrels were serial numbered to the gun, hence the question was the 25-35 serial numbered.

25-35 should be easier to find than 303 Sav, no?

Make sure you have the lever open when you take down the barrel. If it doesn't want to move take it to a smith to free it, alot of guys wreck forearms trying to pry them off a receiver they've been on for 100 years.