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SP vs SR Primer


Tree Rat

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Did some testing today in 9mm.

Kimber Stainless Target

Winchester Brass

Star 115 FMJ @ 1.140

WSR and WSP

81 degree's

47% RH

4.0 N310 with WSR

Low 1147

High 1172

Average 1162

Spread 25

SD 7.11

PF 133,653

4.0 N310 with WSP

Low 1119

High 1150

Average 1131

Spread 31

SD 7.34

PF 130.077

4.3 N320 with WSR

Low 1134

High 1179

Average 1158

Spread 45

SD 12.49

PF 133,118

4.3 N320 with WSP

Low 1121

High 1178

Average 1145

Spread 57

SD 13.47

PF 131,635

The N310 load average increased by 31, was outside the spread, so it may be valid. The N320 load increased only 13, is well within the spread, and is inconclusive. Primer flow was eliminated but all loads still show minor flattening in the 1911, but none in the H&K USP when firing a few rounds (nother story).

Did not do the search. Hopefully some real world data might be more useful and justify the bandwidth.

TR

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Good post Tree Rat! - What sample size did you use? Looks like there should be statistical tests that could be applied to data like this. Where is a statistician when you need one? I may have to dig out my old stat texts yet.

Thanks for taking time to put together your results.

RobT

P.S. How did you measure relative humidity?

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