Can someone please explain why

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Its the powder burning that generate the gas. Gas by it's self in this case is confined to the chamber/barrel. It's a fixed quantity based on what the burning powder. It changes though based on how much powder there is to burn.
 
A gas is not a liquid it can be compressed therefore it does not need more space to create more volume . Just like filling a air tank . You can keep putting more and more in until if fails even though the volume of the tank stays fixed . You can continue to fill it with more and more air or gas , that air or gas just becomes more and more compressed raising pressure until it's released or failure of the tank .

I keep hearing how I'm wrong but nobody has explained what is causing the pressure to rise in the bore if the gas is not expanding ? Something has to be happening to cause the pressure to rise . Just stating the pressure will keep rising is not an answer . We all know that or we would never see pressure signs or catastrophic failures .

I've already said I may be wrong , I'd like a better understanding of how you're right .
>>>>>>A gas is not a liquid it can be compressed therefore it does not need more space to create more volume .<<<<<<

It absolutely does.

I think you're confusing volume with potential volume.

Let's use your example of an air tank.

For purposes of discussion let's say that the tank is 12"x12"x12" and has a capacity of one cubic foot.

Then we take a compressor and pump an additional 1000 cubic feet of ambient pressure air into the tank.

Note that the volume of the tank hasn't changed and it still holds exactly one cubic foot of air, it's just highly pressurized air now.

That cubic foot of air has the mass of 1000 cubic feet of air, and when released from the tank that air has the potential to expand back into 1000 cubic feet of ambient pressure air, but while it's contained in the tank it has a volume of one cubic foot because that's how big the tank is.

The air contained in the tank is not expanding because the walls of the tank have it fully enclosed. The air is constantly exerting pressure, but it can only expand when it is released from the tank.
 
Ok I’ll buy that ,

My original wording should have read . The gases are going to continually “compress” regardless of whats in front of it . This will continue to raise pressures to dangerous levels if the bullet does not get out of the way ??
 
@Metal God
I'd prefer to term it as "build pressure", because "compress" implies an actual decrease in volume rather than an increase in the amount of gas occupying the same volume, but your statement as amended is essentially correct.
 
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