I'm shooting Laser Cast 405gr over Unique. Shoots accurate and very little leading in a Marlin.
18.5" Marlin 1895
405gr Laser Cast
CCI 200
Rem brass
Unique
16gr - 1300 fps
15gr - 1250 fps
14gr - 1190 fps
13gr - 1120 fps
12gr - 1050 fps
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=796585