My plinker load that I am using for this test is often shot in a 5" Colt 1911. With WSP or CCI500 primers it always clears the brass from the gun. When I tried S&B SS primers it would occasionally catch a case. That is a real world difference to me. I have chronoed both the WSP and CCI 500 primers with this load before, more than once, but I haven't chronoed the load using the S&B primers. No matter what this small test shows, there is enough difference that occasionally a case would fail to eject without getting caught.
When I did my test in 40s&w the trend I saw seemed to indicate that Czech (S&B) and Bosnia (Unis Ginex) primers produced lower velocities compared to CCI500 and WSP. With a normal light plinker load I assume the lower velocities could probably cause some failures to eject. It will be interesting to see what differences you find between the different primers. Following are my results from just 4 different primers:
40SW, P229, 3.9"
Case: Federal
Trim: .843"
COL: 1.125"
Xtreme, 165gr, RNFPHPCB, BE86, 5.8gr,
CCI500
Average: 908
ES: 17
SD: 7.3
Velocities: 904, 915, 907, 916, 899
Test Date: 04/21/2017
40SW, P229, 3.9"
Case: Federal
Trim: .843"
COL: 1.125"
Xtreme, 165gr, RNFPHPCB, BE86, 5.8gr,
WSP
Average: 907
ES: 36
SD: 13.5
Velocities: 922, 886, 913, 911, 903
Test Date: 04/21/2017
40SW, P229, 3.9"
Case: Federal
Trim: .843"
COL: 1.125"
Xtreme, 165gr, RNFPHPCB, BE86, 5.8gr,
SBPRSP
Average: 886
ES: 28
SD: 11.6
Velocities: 894, 900, 888, 872, 877
Test Date: 04/21/2017
40SW, P229, 3.9"
Case: Federal
Trim: .843"
COL: 1.125"
Xtreme, 165gr, RNFPHPCB, BE86, 5.8gr,
GINEXSP
Average: 880
ES: 30
SD: 12.1
Velocities: 864, 883, 894, 872, 888
Test Date: 04/21/2017