[bbbean]

Is my Ed Brown Kobra Barrel really that slow? FWIW, my Chrono shows Atlanta Arms and Ammo 230 @ PF-158. Assuming my chrono is accurate, should I consider dropping OAL to 1.2 or 1.22, or should I bump charge up to 4.5?

Date 4/20/2008
Powder Clays OAL 1.25
Charge 4.00 Cal 45 ACP
Bullet HAP Gun EB Kobra
Weight 230 Primer Winchester LP
Temp 68
FPS PF PF less hi/lo
723 166.29 166.29
721 165.83 165.83
723 166.29 166.29
728 167.44 167.44
723 166.29 166.29
716 164.68 164.68
733 168.59 168.59
744 171.12
719 165.37 165.37
692 159.16 159.16
661 152.03
694 159.62 159.62
705 162.15 162.15
688 158.24 158.24
682 156.86 156.86
724 166.52 166.52
685 157.55 157.55
693 159.39 159.39
702 161.46 161.46
683 157.09 157.09
715 164.45 164.45
693 159.39 159.39
686 157.78 157.78
689 158.47 158.47
Mean = 705.08 162.17 162.22
stdev 20.52 4.72 3.96

This post has been edited by bbbean: 20 April 2009 - 08:29 PM

[yoshidaex]

hows the ammo feed at that length? If it feeds good, I would leave it and verify your results using another chrono. Once you verify the results you can decide what to do from there.

IIRC you can load a hollow point slightly shorter than a RN bullet and it'll still feed well, right?

what brand of chrono are you using? Hows that load feel?

[bbbean]

yoshidaex, on Apr 20 2009, 10:42 PM, said:

hows the ammo feed at that length? If it feeds good, I would leave it and verify your results using another chrono. Once you verify the results you can decide what to do from there.

IIRC you can load a hollow point slightly shorter than a RN bullet and it'll still feed well, right?

what brand of chrono are you using? Hows that load feel?

Ammo feeds great, but I don't have another chrono nearby to double check. Its a little snappier than 4.1 and the Atlanta Arms, but still manageable. Its softer than the S&B (which chronos at 170 in my gun).

FWIW, its a Chro Pal by Competition Electronics.

[Jeff Matzka]

I'm betting the chrono's the culprit.

[twodownzero]

I think it's going to take more Clays than that to make major with a jacketed bullet, possibly. Mine makes major at 3.7 with lead, though.