Higher readings

[wingnut]

I am in pa. My readings are higher today than they were in June. In June it was 70 and sunny today 50 and cloudy my velocity jumped from the 970s to 1013 same load no changes 9mm 4,0 WFS Ibejihead 135gr coated AOL 1.128 PF from 130 to 136 is this normal with the weather change.

[leemoe83]

Sunny weather gives my chrono inconsistent readings. On sunny days I put it under shade. Cloudy days are best for accurate readings.

[Hi-Power Jack]

How many shots did you fire over your chrono to derive the 970 and 1013 FPS?

[Sarge]

Lots of possibilities here.

Sun vs shade.

Temp sensitivity of WFS. Do some research and see if its reverse temp sensitive.

Variance in charges thrown.

Variance in oal.

Variance in chrono reading accuracy.

I have pretty low SD in my loads but I still occasionally get some hi/low oddballs. Maybe you just had a string of higher than usual shots in the same string.

Jack makes a good point. I don't derive anything solid unless I have shot a BUNCH of rounds over the chrono. Typically hundreds.

[wingnut]

Usually I shoot 10 when I started seeing this I shot 20 got the same thing. I just switch from a square deal to a 1050 but my drops are very consistent I check about every 15 to 20 drops. My AOL has not changed.