I have no loading data for 230 g HSM FMJ RN bullets. I am thinking if I keep the volume in the case the same as some published data by adjusting the COL that it should be a safe load. Here is my thinking. Hornady shows a COL of 1.23 for the 230 gr FMJ RN ENC bullet. The Hornady bullet measures .643 in length the HSM bullet measures .622 in length both 230 gr FMJ RN. In order to have the same volume in the case for the HSM as the Hornady I need to reduce the COL for the HSM to 1.209. (Reduced by the difference in length of the two bullets (.021) in order to keep the same volume). Then I should be able to use the loading data from the Hornady chart. I realize there will be some small difference in FPS due to small difference in the 2 bullets design. Does this make sense and is it safe? Are there any loading charts for the HSM bullets..I have searched the forum and found none. Thanks Joe