I was refering to Lyman's 49th, .30-30 lead 170 grain lead data, where IMR4198 is at the bottom half of the powders listed, with some of the higher velocities (out of their test barrel, which is quite a bit longer than a Marlin's). I had never really considered plated bullets. Should these work well?
http://missouribullet.com/details.php?prodId=354&category=6&secondary=36&keywords=
What velocities are you able to see with coated? Again, referencing Berry's website, their bullets are rated for 1700 FPS, which is well below, again, test barrel velocities.