I have done some testing this weekend with Longshot and PowerPistol loads using the ACME 158gr SWC coated bullets. These tests were done to up my last PowerPistol load, and also get a baseline for Longshot. Following are the test results:
The Longshot loads could be increased to generate more pressure. It seems the ES/SD numbers were not as good as the PowerPistol loads, but the groupings were slightly better.
357mag, Ruger SP101, 3"
COL: 1.620"
ACME, 158gr, SWCNLG, Longshot, 8.0gr, SBPRSP
Average: 1055
ES: 20
SD: 8.5
Force: 390
PF: 166
Velocities: 1049, 1065, 1062, 1054, 1045
Grouping @ 15yards: 2.36"
Comments: No problem ejecting spent cases.
357mag, Ruger SP101, 3"
COL: 1.620"
ACME, 158gr, SWCNLG, Longshot, 8.2gr, SBPRSP
Average: 1090
ES: 31
SD: 12.6
Force: 417
PF: 172
Velocities: 1101, 1071, 1087, 1089, 1102
Grouping @ 15yards: 2.03"
Comment: Slight stickiness when ejecting spent cases.
The following load was just a one round load just to see if the velocity will increase and to verify the spent case. No issues found, so I should be able to increase the loads even more.
357mag, Ruger SP101, 3"
COL: 1.620"
ACME, 158gr, SWCNLG, Longshot, 8.4gr, SBPRSP
Average: 1128
ES: 0
SD:
Force: 446
PF: 178
Velocities: 1128, , , ,
Grouping @ 15yards: None
Comment: Slight stickiness when ejecting spent cases.
357mag, Ruger SP101, 3"
COL: 1.620"
ACME, 158gr, SWCNLG, PowerPistol, 7.9gr, SBPRSP
Average: 1079
ES: 23
SD: 8.8
Force: 408
PF: 170
Velocities: 1083, 1064, 1081, 1080, 1087
Grouping @ 15yards: 2.64"
Comment: Slight stickiness when ejecting spent cases.
357mag, Ruger SP101, 3"
COL: 1.620"
ACME, 158gr, SWCNLG, PowerPistol, 8.1gr, SBPRSP
Average: 1098
ES: 9
SD: 3.8
Force: 423
PF: 173
Velocities: 1096, 1102, 1093, 1101, 1100
Grouping @ 15yards: 2.56"
Comment: Slight stickiness when ejecting spent cases.