Not sure if this the right place to post,but-- I'm toying with trying "long range" with my Marlin 336 in 30/30. I need to use cast lead bullets. I am looking for any reloading help that can be offered. The rifle is of the Micro-groove design and shoots plated 170 gr. the best. Recommendations on bullet weight and powder to use would be helpful as well as bullet diameter. My books show .308, but, but what I've found so far are .309. Also, a good source for bullets.