Originally Posted by Cheyenne
As promised, I went out and ran my own test today to add to the knowledge base. The test guns were a Sig P365 and a Sig P365 XL. I used 124 grain Precision Delta jacketed round nose bullets, 4.3 grains of W231 and mixed brass, loaded to 1.155" OAL. All results were obtained using a Labradar.

The primers were recently purchased Federal No. 100 Small Pistol Primers and some older Federal No. 200 Small Rifle Primers in the old red box. (If I use any rifle primers in my pistols, these would be the ones, so I used those. Sorry.) The results were:

Sig P365
Federal Small Pistol- Average 1017, high 1028, low 1005, extreme spread (ES) 23, SD 7.6. 10 shots
Federal Small Rifle-Average 1020, high 1035, low 1002, ES 33, SD 9.7. 10 shots

Sig P365 XL
Federal Small Pistol-Average 1059, high 1076, low 1042, ES 34, SD 11.0. 10 shots
Federal Small Rifle- Average 1057, high 1084, low 1044, ES 39, SD 12.2. 10 shots
(Also, from notes, using Winchester Small Pistol Primers for Standard Loads-Average 1043, high 1060, low1025, ES 35, SD 13.9. 5 shots.)

There were no malfunctions. I did not test for accuracy, but the velocities are the same and I would not anticipate any difference. I should have compared the primers in the fired cases like Waders did, but I forgot. I will have to do that next time I load using SRPs.

Take care!


Statistically, no difference. Very good to know.

Thank you for taking the time to perform the tests and provide your detailed field report.

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell