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Yeah pretty much, I hadnt read your post I just scolled down till I hit scribes question that I asumed was directed at me then hit reply.

Hmmm bit condescending but you might be right. James I was wrong about the helicopter, apparently your going to need something really high to jump off.:D

Scribe put simply the ambient temp makes the powder warmer or cooler. Warm powder will burn faster than cold powder creating more pressure which intern creates more velocity.There are plenty of...

So in conclusion I think its safe to say to James that without any doubt at all his velocity loss has nothing to do with a helicopter

Moisture or humidity has very little effect on bullet flight, the density of air is more relevant but I couldn't say its because its " more or less sticky" high pressure cold air is denser and...

Scribe thats a slightly different question, the issue here is around powder/barrel/chamber temp, the variation between winter and summer and how that affects muzzel velocity. The effect of...

Normally Id say a 90fps drop was highish for an ADI powder but a range of things will have an influence.Firstly at 550yds a 90fps difference is less than 4 inches( aprox) which can be hard to...

James did you validate your original velocity at decent ranges? and what distances where you shooting last weekend to determine the velocity loss?