Shooting Appliances

[c19o]

I have a 2" X 78" air chamber and an 86" X 1.5" Golfball barrel, 1.5" porting piston valve, the angle iron estimated at around 1.5kg.

So in GGDT I put in 2" piston diameter and 1.5" sealing face and 1.68" for the barrel. I think its overestimating it though, do I actually measure the pipe or put in what the pipe says it is?

[DYI]

You put in what the pipe actually is. GGDT doesn't have anything built in to automatically convert to the real pipe measurements.

I guess I was right about the massively oversized chamber though.

[c19o]

Ok I measured a piston that was on my desk, got 1.59 sealing face and 1.75 piston diameter. That gave it 1149 ft-lbs with a 1.5kg projectile.

I guess I was right about the massively oversized chamber though.

And I even though of putting a 3" chamber on it