Quote:
Originally Posted by Fox62
As said before, it will change considerably on a GBB; hence why I've always thought FPS measurements are obsolete and force people to chrono with .20's (giving the wrong energy read for someone gaming a GBB with .40s). Guns should be chronoed in Joules, and with the BB weight they are going to be using in game.
Fox.
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You are absolutely right sir.
But He was talking about AEG's. Anything spring powered will maintain it's joule rating over any BB weight.
However anything GAS powered will change it's joule rating depending on the weight of ammo used.
And so chronoing with .20s is standard and very accurate for AEGs, but you're correct in saying that GBBRs need to be chrono'd with the BB weight they will be using in game, and a conversion to joules must be done.
Here in Mb, we write out the max FPS for each BB weight. So there's different FPS limits for each BB weight, but they all come out to the same force (1.48j for auto, 2.04j for bolt)
And +1 to everything McKee said. Through field trials I've found that all BB's generally have an optimal relative velocity of 330-360fps.
For example, at 2.04j (470fps on .20s), a .30g BB will have LESS accuracy than it does at 1.7j (430fps on .20s)
This was compared side by side with 2 marui VSR-10s of the same internals, and again on one marui VSR-10 with a 470 then 430fps spring.