I finally got around to making a load for my GP100. After some research and not finding much to go on for Titegroup I started my load at 6.5GR. My first batch were made using 158gr xtreme plated RNFP, S&B SPP, and an OAL of 1.575. I also used a single stage press to make these 6. I made chrono'ed at 1024, 1056, 175, 1108, 1057, and 1086. The extreme spread was 84 with a standard deviation of 28.
I then set up the Dillon 450 for 357 to see if it made a difference. This time I used 6.5 gr Titegroup, 158 gr Semi Jacketed Hornady XTP #3575 bullets from sometime in the 80's. I loaded them to an OAL of 1.590. The chrono came back at 1131, 1122, 1118, 1109, 1107, and 1091. The extreme spread was 40 and standard deviation was 13.
Since I will run out of the old school Hornady bullets before the xtremes I have I decided to try again on the 450 the 158 gr plated. I used the setup I had for the previous OAL, but ended up with 6 rounds OAL of 1.586, 1.587, 1.588, 1.589, 1.588, 1.587. The chrono came back with 1054, 1077, 1111, 1073, 1060, and 1068. The extreme spread was 57 with a standard deviation of 20.
I shot each round by itself and checked the brass for any splits, or pressure signs. I did not see any, and the cases were pretty clean. Forgot to mention the brass I used was NOS Midway head stamped brass.
From my observations I was able to load a tighter round with the 450 than on a single press. I also think the velocities I got on the Chorno are well within range for 357. I did notice though that when I started to load on the progressive my OAL slowly went from 1.586 to 1.589 and then started back down to 1.587 as the positions became empty.
Feel free to critique or make suggestions to better my 2nd and 3rd loadings.
I then set up the Dillon 450 for 357 to see if it made a difference. This time I used 6.5 gr Titegroup, 158 gr Semi Jacketed Hornady XTP #3575 bullets from sometime in the 80's. I loaded them to an OAL of 1.590. The chrono came back at 1131, 1122, 1118, 1109, 1107, and 1091. The extreme spread was 40 and standard deviation was 13.
Since I will run out of the old school Hornady bullets before the xtremes I have I decided to try again on the 450 the 158 gr plated. I used the setup I had for the previous OAL, but ended up with 6 rounds OAL of 1.586, 1.587, 1.588, 1.589, 1.588, 1.587. The chrono came back with 1054, 1077, 1111, 1073, 1060, and 1068. The extreme spread was 57 with a standard deviation of 20.
I shot each round by itself and checked the brass for any splits, or pressure signs. I did not see any, and the cases were pretty clean. Forgot to mention the brass I used was NOS Midway head stamped brass.
From my observations I was able to load a tighter round with the 450 than on a single press. I also think the velocities I got on the Chorno are well within range for 357. I did notice though that when I started to load on the progressive my OAL slowly went from 1.586 to 1.589 and then started back down to 1.587 as the positions became empty.
Feel free to critique or make suggestions to better my 2nd and 3rd loadings.