k when i enter measurements for volume (plus i think you should just be able to enter the volume) i get a different answer than what i get on my calc.

i'm trying to do a coax gun in it, and thus found the volume of the actual chamber space to be 97.2 inches. then i divided this by pi, then divided it by r2 of 4" pipe. and it says it should be 7.7 inches long, and this checks out. but when i run these exact same calculations in GGDT, it comes out with 25. something cubic inches... am i just way too tired right now or is GGDT messed up??

ALSO, how can you try and portray a coaxial gun in GGDT? would you just run it like a barrel sealing gun?

Thanks

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