For up close and personal encounters in thick marsh scrub, I favour my Marlin 1895SS 45-70 and handloaded Remington 300gn HPs doing 2140ft/s ("The One Hit Wonder"). Since this photo was taken, I havemounted a 1.5-5x20mm Leupold (matte) on the Marlin.
For more open areas, like the western plains of NSW, I can't fault my Ruger M77 30-06 and Speer 165gn SPHotCors doing 2780ft/s.