Epicurean
Member
I finally got my ProChrono running (it appears to be inoperable in not just fluorescent light, but halogen as well) with the addition of the Indoor Lighting Setup. I shot three short strings mainly to confirm my understanding the chrono operations.
First string - eight shots from a cold Sig P239 using Federal 115 grain FMJ to establish a base line.
Average - 1071 fps
ES - 39
Std. Dev. - 12
Second String - eight shots from a warm Sig P239 using my load of 115 grain MBC LRN, 5.0 grains Unique, CCI primer, mixed brass, 1.075" OAL
Average - 1064 fps
ES - 52
Std. Dev. - 18
Third string same as second string except from cold Sig P226
Average - 1117
ES - 89
Std. Dev. 28
This is my first reload in 9mm. There were no failures in any string.
I had hoped and expected that my loads would perform at least as well as Federal range ammo. Alas, no dice.
So here's my questions.
1) How long should a string be to be viable?
2) Is the culprit here the mixed brass, novice loading or both?
3) Should I try to "tweak" this load or try something else? (I have Bullseye and Clays on hand)
First string - eight shots from a cold Sig P239 using Federal 115 grain FMJ to establish a base line.
Average - 1071 fps
ES - 39
Std. Dev. - 12
Second String - eight shots from a warm Sig P239 using my load of 115 grain MBC LRN, 5.0 grains Unique, CCI primer, mixed brass, 1.075" OAL
Average - 1064 fps
ES - 52
Std. Dev. - 18
Third string same as second string except from cold Sig P226
Average - 1117
ES - 89
Std. Dev. 28
This is my first reload in 9mm. There were no failures in any string.
I had hoped and expected that my loads would perform at least as well as Federal range ammo. Alas, no dice.
So here's my questions.
1) How long should a string be to be viable?
2) Is the culprit here the mixed brass, novice loading or both?
3) Should I try to "tweak" this load or try something else? (I have Bullseye and Clays on hand)