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Old 28th January 2016, 01:18 PM
verminator verminator is offline
Join Date: May 2010
Member of: Bisley
Location: London
Posts: 94

Originally Posted by Brian.Samson View Post
Ok here's the scenario I want you to calculate using the Rifleman's rule.

You have a rifle that is zeroed at 10 yards, you want to hit a 15mm target that is directly above you, but 10 yards away from the end of your barrel.

Where do you aim?

The rifleman's rule says you consider the horizontal distance to the target (this would be 0 - it's directly above you)

So you would aim in the same spot you would need to aim if the target was touching the end of your barrel. (according to the Rifleman's rule)

In this situation the Rifleman's rule would tell you that you need to aim above the 15mm killzone by the height of your scope in order to hit it.

That's not correct, what you would actually need to do to hit that target is aim a tiny bit low in the kill - a couple of mm. You might say - ah but this is just some weird situation you've chosen and the Rifleman's rule is generally correct. It isn't though, I could give you lots of examples where it's wrong. The reason it's wrong is that most of the shots in airgunning tend to be quite close and the rifleman's rule is spectacularly wrong at close range. (As that example should illustrate).

The bendy barrel thing.. that's just mad

The real reason does have something to do with Gravity (alot actually) but it isn't the effect of gravity on the barrel, it's the reduction in the effect of gravity on the horizontal trajectory that's important.
The whole point of the Rifleman's rule is to account for the whole gravity thing, but it is clearly missing some detail that causes error in short-range shots.

Thanks for the example, I will go away and chew on it some more...
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