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40 S&W loads for PF


Sig0431

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Went out today to chrono some 180 gr black bullets. I had three sets loaded at 4.6, 4.4 and 4.2 with N320. Shot 10 rounds each and my PF was in the 260's - 270's for all strings. I find this hard to believe and wonder if my chrono has started to die. 

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  • 2 weeks later...
On 6/8/2018 at 4:30 PM, RH45 said:

I'd guess that it was sunny. I've found that the best time to chrono is when it's overcast.

In Arizona that can be a LONG wait!

If your chrono has sky screens try to make sure that both the start and stop sensor are shaded, preferably an equal amount, by the sky screens.  Having a tripod with a head that is adjustable for cant/tilt and rotation is really handy in this situation.  You could also clip a cardboard target to the screens to get more shade but you do want some light transmission so it is better if you can get the screens to shade the sensors.

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