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I do recall, thanks for the tip. I also recall when we used twink or similar, NIGHT EXERCISES. Got a reasonable excuse for forgetting though, I was 18 at the time and I'm not now.

I think you're onto something re the blade shape. Might reshape it, vertical blade, also will make another a few thou taller. Brighten them both and see what happens.

csmiffy. Good point about the twink. Forgot about that, used to do the same with L1A1 decades ago.

From memory varying light does have an affect point of impact. Case in point Baikal with peep sight shooting 4" high at 100 meters in sunny conditions. Then in heavy overcast shooting spot on. I...