Hi all,
Just got 1000 124 mpr bullets and am excited to get some loads developed. Have read every thread pertaining to these bullets so many times my head hurts. Have got a lot of good input on my first thread for some berry’s bullets so I’m dipping in for some more knowledge from people with experience with these. Sadly I am in the club of people that are required to load these at a very short oal. 1.048 is the absolute max that will plunk. So I am looking at a working oal of 1.035-1.040. I have read a lot where people are referring to hornady 124 xtp data so I bought the 11th edition which lists oal of 1.060 for the xtp. I have some cfe pistol powder that I will probably base my starting loads with the hornady data and work up carefully because of the shorter oal. I would like to develop a load using n340 first for the mpr bullets. I have the Sierra 6th manual and for their 125 jhp #8125 they list data at 1.030. The Vv app lists data for this bullet at 1.035. I have a couple boxes of these bullets to compare to the mpr 124. The mpr that I just received measure .545 which is shorter than I have seen reported in other threads here. The Sierra 125 jhp measures an average of .550 so a little longer. The bearing surface appears to be longer on the Sierra as the ogive is a lot sharper angle than the mpr. In my estimation the data for this bullet should match up very close to the mpr. So after all that my primary question is if anyone else has used Sierra 6th data for the mpr or if you all think I’m on the right path. Also posted to possibly help others who are at odds with having to load these beauties really short.
Just got 1000 124 mpr bullets and am excited to get some loads developed. Have read every thread pertaining to these bullets so many times my head hurts. Have got a lot of good input on my first thread for some berry’s bullets so I’m dipping in for some more knowledge from people with experience with these. Sadly I am in the club of people that are required to load these at a very short oal. 1.048 is the absolute max that will plunk. So I am looking at a working oal of 1.035-1.040. I have read a lot where people are referring to hornady 124 xtp data so I bought the 11th edition which lists oal of 1.060 for the xtp. I have some cfe pistol powder that I will probably base my starting loads with the hornady data and work up carefully because of the shorter oal. I would like to develop a load using n340 first for the mpr bullets. I have the Sierra 6th manual and for their 125 jhp #8125 they list data at 1.030. The Vv app lists data for this bullet at 1.035. I have a couple boxes of these bullets to compare to the mpr 124. The mpr that I just received measure .545 which is shorter than I have seen reported in other threads here. The Sierra 125 jhp measures an average of .550 so a little longer. The bearing surface appears to be longer on the Sierra as the ogive is a lot sharper angle than the mpr. In my estimation the data for this bullet should match up very close to the mpr. So after all that my primary question is if anyone else has used Sierra 6th data for the mpr or if you all think I’m on the right path. Also posted to possibly help others who are at odds with having to load these beauties really short.