From experience and reading some what, it seems much of extending barrel life revolves around lowering working pressures and barrel temp. Keeping your barrel cool/er during range sessions, no doubt, has a positive effect on extending your barrel life. When George Gardner, GAP rifles, won last years Snipers Hide cup with his 6.5 SAUM, he had, IIRC, somewhat over 4 or 5k rounds down his barrel. His 6.5 SAUM load just doesn't need that much pressure to achieve the velocity he seeks.
Alan
