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We’re putting four different chronographs for airguns ranging from £49.50 to £265 on the test bench. Fortunately, if maths isn’t your thing, plenty of calculators on the internet will do the number-crunching for you.
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To work out the energy output, the feet per second (fps) reading has to be multiplied by itself, then multiplied by the weight in grains of the pellet and divided by 450,240. (Looking for a compressor for airguns – take a look at our list of the best options.) How they workĬrudely put, chronographs measure the time it takes for a pellet fired from a gun to pass between two sensors. It will also help you identify potential problems, and for you tinkerers out there, it will validate the effectiveness, or otherwise, of your labours. (Check our list of airgun laws you should know.)įor example, a ‘chrony’ will determine the sweet spot on your PCP – the fill pressure range where your rifle is most consistent. They also have many more uses beyond keeping you legal. However, many of us like to tinker with our rifles – springer owners love nothing more than fitting tuning kits, and I’ve lost count of people who’ve told me about the ‘mods’ they have made to their PCP air rifles.įortunately chronographs for airguns will help you stay on the right side of the law. Personally speaking, everything I touch with a spanner explodes in a cloud of springs and cogs and can only be fixed with the skilful application of a credit card. However, the reality is that even new guns can see power levels creep up over time. (Read our list of the best airgun pellets.)
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Manufacturers go to extraordinary lengths to ensure their products comply, and licensed gunsmiths know that any breach would have serious consequences for their livelihood. There really is no excuse for exceeding the legal power limit and that’s where chronographs for airguns are useful kit. Responsible airgunners know that without a Firearm Certificate (FAC), possessing a rifle that pushes out more than 12 foot pounds (ft-lb) will not only get you into trouble, but fuel the argument of those who’d like to see our sport disappear. Ignorance, it is said, is no defence in law.
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