I don't re-use if I have to change or adjust rings. I usually keep the B&R if I sell a rifle w/o scope and if everything remains lined up when I stick the B&R on a new action, I have no qualms about using them, but I had one base get slightly boogered .. too subtlely to tell visually .. which lead to accuracy problems and wasting a bunch o' components before realizing what the problem was. (Credit goes to a gunsmith friend who asked if I'd re-used the bases.) Once I swapped in all new stuff, accuracy problems vanished. To me it's not worthwhile. Dual dovetail bases are .. what, maybe $20? False economy.
