Quote:
Originally Posted by WPJ
So to be safe are the fields able to test for the kinetic energy when leaving the barrel or is everyone just assuming.
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I've tried to get everyone on the joule bandwagon, but some fields still test all guns with .20g BBs and assume the joule curves for heavier ammo are linear.
5.7j is difficult enough to produce with an airsoft gun, you'd need a pretty long barreled GBBR to come close. So don't worry about anyone being over 3j, it's quite rare to begin with.
The most accurate way to make sure an airsoft gun is within the joule limit (if an "fps limit" is stated as being 400fps with a .20g BB, then it's a joule limit, not an fps limit) is to chrono that gun with the weight of ammo it will be using. Then make the conversion to joules.
To chrono people quickly, I wrote the max fps of every common BB weight for a specific muzzle energy on the top of my chrono. Who cares what fps they're shooting, as long as it's under the limit, right?
Issues that come up, people can obviously lie about what weight of ammo they're using.
However, in chronoing with .20s, a GBBR specifically, but also an AEG, could end up being quite a bit over the limit. Anywhere from 20-80+fps