Recently purchased a used Lyman 457191 to have a lighter bullet to reduce recoil in my 45/70's and to use for Cowboy side matches out to 200 yards provided it proves to have adequate accuracy. I believe the mold is an older one as it is in small blocks and has no bevel base. Casts at .459" on the base band and the others are .4575" and right at 300gr in 20/1. Loaded a few with 13 and 14 gr Unique and 20gr 2400 to test. 100 yard accuracy with the Unique loads was about 4-5", not good. The 2400 load showed more promise with 3 into and inch and with 2 others opening the group to just over 3 inches. Loved the lack of recoil with these loads compared to the 457193's at 1350fps I have been using for the lever gun side matches. Need more work to try and improve the accuracy.