Interesting topic.
I tried Longshot a few times, but did not write down any comments. What I think I think I remember is that it was soft push type recoil for the lower charged loads. I should probably load up a few again and refresh my memory. My records show that I loaded some additional plinking rounds for the 6.2gr load, so it was probably not a bad load. The SD/ES numbers are high, but that is expected since Longshot performs better at higher pressures.
Following is my test data from the Longshot loads I tested:
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 5.9gr, CCI300
Average: 605
ES: 63
SD: 26.1
Force: 187
PF: 139
Velocities: 587, 650, 606, 596, 588
Grouping @ 15yd: 1.11"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6gr, CCI300
Average: 606
ES: 64
SD: 25.1
Force: 188
PF: 139
Velocities: 616, 619, 570, 634, 593
Grouping @ 15yd: 1.05"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.1gr, CCI300
Average: 620
ES: 116
SD: 42.6
Force: 196
PF: 142
Velocities: 606, 638, 560, 676, 621
Grouping @ 15yd: 1.28"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.2gr, CCI300
Average: 648
ES: 111
SD: 40.7
Force: 214
PF: 149
Velocities: 708, 632, 597, 661, 646
Grouping @ 15yd: 0.98"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.3gr, CCI300
Average: 679
ES: 48
SD: 19.3
Force: 235
PF: 156
Velocities: 685, 676, 662, 665, 710
Grouping @ 15yd: 1.37"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.4gr, CCI300
Average: 664
ES: 126
SD: 47
Force: 225
PF: 152
Velocities: 691, 659, 592, 664, 718
Grouping @ 15yd: 1.29"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.5gr, CCI300
Average: 727
ES: 63
SD: 23.3
Force: 270
PF: 167
Velocities: 732, 735, 752, 689, 731
Grouping @ 15yd: 0.91"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.6gr, CCI300
Average: 719
ES: 75
SD: 28.4
Force: 264
PF: 165
Velocities: 703, 764, 717, 725, 689
Grouping @ 15yd: 1.16"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.7gr, CCI300
Average: 749
ES: 36
SD: 13.8
Force: 286
PF: 172
Velocities: 749, 762, 726, 756, 753
Grouping @ 15yd: 0.93"
Test Date: 12/28/2018
45acp, P220, 4.4"
Case: Federal
COL: 1.255"
RMR, 230gr, FMJRN, Longshot, 6.8gr, CCI300
Average: 743
ES: 41
SD: 17.2
Force: 282
PF: 170
Velocities: 725, 755, 739, 730, 766
Grouping @ 15yd: 0.96"
Test Date: 12/28/2018