I have a 16 inch barreled Rossi M92 clone And I am looking for information on the heavier cast bullets that will function in this rifle. I have a LEE mold that makes a 255 gr, RF style bullet but it seems to be a pretty short bullet design though nose shape is acceptable. The rifle will feed Keith style bullets. Would like a bullet in the 290 to 320 grain weight range. Prefer a flat based design.