The problem is likely the distance from the screens. I don't know how much muzzle blast effect there is from the shotgun, but I've seen a lot of guys report funny numbers, both high and low, that clear up when they move the chronograph out to 10 feet or more. One fellow shooting a .338 Lapua said he had to go to 18 feet before it stopped triggering irregularly. Mojo's use of two chronographs is one strategy for addressing this.
Chronographing shotgun loads
I shot through a chronograph with my shotgun a couple of days ago and read a startling number on one shell. I wonder how accurate these rigs are with a fragmenting mass passing through them. Anyone know about this?
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