As far as ported barrels go my Marlin Guide Gun has 16 or so ports at the muzzle. I shoot 330g hardcast lead bullets past 1800fps and as high as 2000fps. There is nothing in those ports or on the front sight that a quick wipe with a oiled patch won't remove, even after 250 rounds I don't have to clean them.
If you are talking about properly fitted hard cast bullets, you will not have a problem. When you shoot cast, that are of an appropriate alloy, sized to fit, from snug to tightly in the throats of your revolver, and gas checked, you will probably never shoot jacketed rounds again. The accuracy, AND ON GAME Leathality, is a lot better. With game such as elk, hardcast, I would consider "manditory"
300g WFNGC @ 1300fps, Bull will not go far if shot inside a 100yds or so.
Have fun.