YOu can use the Hodgdon site and use appropriate 170gr. jacketed information. I think I used 33gr. On my remington 170gr. core lokts. Start low and work up carefully. Be aware that cast boolits sometimes are more accurate sized .311 for Marlins, and that the most accurate loading may be a bit slower than the general max Varget data. Varget downloaded has never worked well for me, and in fact for that boolit, I prefer H4198 at about 18gr. Its significantly slower, but easy shooting and very accurate. If I wanted to hunt, I'd be careful about my alloy, and perhaps hollowpoint the bullet. Expansion with these is sometimes questionable even with wheel weights.