Gas

[40UP]

Here's a question - does anybody know the volume of gas produced in a cartridge? In other words: in a barrel of infinite length, where would the wad stop when the expanding gas reached atmospheric pressure. I asked Tim Woodhouse some time ago but he didn't know.

 

[** Pending Removal **]

Great question 40. I bet I can guess who will be first back with the detailed answer.

 

[TobyM]

It won't be me, I can guarantee that :.:

 

[GlenPresley]

and why would you want to know this? Are you retired 40UP and looking for things to do?

 

[40UP]

It's noticeable with certain cartridges in longer barrels that the report is reduced over shorter barrels implying that the combustion is complete with no blast as though the expansion has finished. So where would the wad stop?

 

[GlenPresley]

well you have confused me! Does not take much though! :wink: :wink:

 

[** Pending Removal **]

It's noticeable with certain cartridges in longer barrels that the report is reduced over shorter barrels implying that the combustion is complete with no blast as though the expansion has finished. So where would the wad stop?

My hero

 

[Salopian]

40UP,

That is a very good question, possibly irrelevant though.

The wad obviously is being driven by the gas from the burn of the propellant which in turn drives the shot charge. We all know that once exiting the barrel no matter what the length of barrel is, the wad will often fly twenty yards plus.

If we had a very long barrel (100 yards? plus ) then we could answer your question.

Of course with the super duper dogs danglies Beretta DT11 shooting fibre wads, our science would fly out the window due to gas escape around the wad.

 

[40UP]

Bit like a deflated balloon. Except for the DT11, the led shot tries to go sideways first pinning the wad to the barrel. Friction would stop the wad without pressure, the shot carrying on. The only other way would be to fire it in a sealed room. Not recommended.

 

[VicW]

I reckon those guys in the Beretta Outlander topic are researching this question!

Vic.

 

[40UP]

Yes Vic, trouble is they're ported 30" extended chokes but are threaded again so you can build them like Construx. Pity about the holes that let the gas out but they obviously have no wad problems or it would be like mole hunting