The RMR 9mm 147gr FMJFP bullet loads were also tested on Tuesday. These loads were basically done to test how well the FMJFP bullet performs against the RMR old plated 147gr bullet, and compare the results between the chamfered and expanded/crimped cases.
Based on the results I saw, I don't see any reason why I should change from my normal expand/crimp routine to a chamfer routine. It seems that the crimped rounds actually performed better than the chamfered rounds. Obviously I don't know why the crimped rounds performed better, but it could be that with the expansion die, the neck is actually shaped and belled. It could be that the chamfered cases could do better with a shaped but not belled process. Following is a quick summary of the data:
-Velocity: Average velocities were very similar
-ES/SD Numbers: The crimped loads had better numbers in 3 out of 5 loads. Crimped loads had one 20+ ES, with chamfered loads two 20+ ES. Close but better number from crimped rounds.
-Grouping: The crimped round loads had better groupings in 4 out of 5 loads, with two loads in the .5" bracket. The best the chamfered loads did was two results in the .7" bracket. Overall the crimped loads performed better in the accuracy category.
Following are the results. All loads tested at 15yards using a rest and a non-zeroed scope:
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.5gr, CCI500
Average: 970
ES: 11
SD: 5.5
Force: 307
PF: 142
Velocities: 966, 977, 976, 968, 966
Grouping @ 15yd: 0.55"
Test Date: 11/20/2018
Notes: Expanded/Crimped
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.5gr, CCI500
Average: 976
ES: 34
SD: 13.4
Force: 311
PF: 143
Velocities: 988, 978, 954, 985, 978
Grouping @ 15yd: 0.71"
Test Date: 11/20/2018
Notes: Chamfered
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.7gr, CCI500
Average: 1006
ES: 17
SD: 6.8
Force: 330
PF: 147
Velocities: 996, 1013, 1006, 1012, 1007
Grouping @ 15yd: 0.72"
Test Date: 11/20/2018
Notes: Expanded/Crimped
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.7gr, CCI500
Average: 1000
ES: 63
SD: 26.4
Force: 326
PF: 147
Velocities: 954, 1008, 1013, 1017, 1012
Grouping @ 15yd: 1.44"
Test Date: 11/20/2018
Notes: Chamfered
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.9gr, CCI500
Average: 1038
ES: 30
SD: 12.3
Force: 352
PF: 152
Velocities: 1033, 1046, 1031, 1056, 1026
Grouping @ 15yd: 1.04"
Test Date: 11/20/2018
Notes: Expanded/Crimped
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 5.9gr, CCI500
Average: 1043
ES: 18
SD: 7.6
Force: 355
PF: 153
Velocities: 1048, 1031, 1047, 1049, 1040
Grouping @ 15yd: 1.4"
Test Date: 11/20/2018
Notes: Chamfered
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 6gr, CCI500
Average: 1064
ES: 19
SD: 7.4
Force: 369
PF: 156
Velocities: 1065, 1057, 1059, 1076, 1064
Grouping @ 15yd: 0.5"
Test Date: 11/20/2018
Notes: Expanded/Crimped
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 6gr, CCI500
Average: 1063
ES: 11
SD: 4.8
Force: 369
PF: 156
Velocities: 1069, 1064, 1058, 1059, 1067
Grouping @ 15yd: 0.78"
Test Date: 11/20/2018
Notes: Chamfered
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 6.1gr, CCI500
Average: 1071
ES: 12
SD: 4.8
Force: 374
PF: 157
Velocities: 1073, 1069, 1065, 1075, 1077
Grouping @ 15yd: 1.39"
Test Date: 11/20/2018
Notes: Expanded/Crimped
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 147gr, FMJFN, CFEpistol, 6.1gr, CCI500
Average: 1071
ES: 13
SD: 5
Force: 374
PF: 157
Velocities: 1072, 1063, 1071, 1074, 1076
Grouping @ 15yd: 1.13"
Test Date: 11/20/2018
Notes: Chamfered