So true, but it happens faster in a high pressure small capacity case like the 9MM vs the low pressure large case .45 ACP, thus my comment as not being as user friendly, it can go from OK to bad quick, fast, and in a hurry in 9MM. At .45 ACP operating pressures if you go over a tenth or two you are still a good ways off from blowing up the case/gun. In the 9MM you are already up there pressure wise at max and when you go over that it's more hazardous, and with the case being so small it happens quicker as well.I'm not trying to start an argument here, but you can get in to dangerous territory with TG in either caliber,
Yep, all because of the small case capacity operating at high pressure.My problem with TG in 9mm is the extreme sensitivity to seating depth.
Pressure and weight.Two words:
Agreed.This isn’t about Titegroup, it’s the context in which the example was intended . Which is why you need to reduce your charge the heavier a bullet you use
Incorrect....remember the gas is going to keep expanding at it's specific rate regardless of what's in front of it trying to slow it down...
papajoe222 asked:
"...don’t understand why a load for a lighter bullet requires more powder than used for one 10-15gr heavier."
There is no "specific rate" of gas expansion. By definition, the gas can't expand at all until there's space for it to expand into.remember the gas is going to keep expanding at it's specific rate regardless of what's in front of it trying to slow it down .
Swampman , it’s interesting you think I was incorrect. Please tell me how the gun or case will fail if the gases don’t continue to expand ? It’s that continuous expantion that causes the failure.
Compressing gas is not the same as powder "burning". Think of powder "burning" as solid matter "converting to gas state" and since gas state occupies larger volume of space than solid state, you either have expansion of space with no increase in pressure if not confined or increase in pressure if space is confined.but isn’t the burning powder creating gas ... I think of it as filling an air tank . Isn’t the air you are filling the tank with expanding into the tank resulting in builing up pressure with in that fixed space?
I believe things happen much quicker and by the time the bullet is down the bore, maximum chamber pressure has already been reached and pressure is decreasing.Don’t these gases start out very very small as the powder starts to burn . There should be plenty of space in the bore of a firearm for the gases to keep expanding until pressure is to great and things start to fail
It's like boiling a tablespoon of water into a large collapsed/flat plastic bag without increase in pressure vs boiling a tablespoon of water inside a 2 liter bottle. Unconfined, liquid water will change state to steam and inflate the plastic bag but confined by 2 liter bottle, liquid water will change state to steam and increase pressure, perhaps to point of rupture.
Yep.I believe things happen much quicker and by the time the bullet is down the bore, maximum chamber pressure has already been reached and pressure is decreasing.
Perhaps this will help.Now, theoretically, the powder speed, case capacity, and barrel length could peak pressure right before exit I guess.At what pressure does powder gases stop becoming gas and only create pressure?
But for the most part, pressure is diminishing when the bullet leaves the barrel.
I came late to your discussion after responding to OP just to clarify.Giving examples of the Firarms acting correctly it’s not helping this part of the discussion . The claim is if the bullet stops moving in the bore the gases stop expanding . I’d like to know why and or how that happens . Also what then creates the pressure that blows them up if the gas has stopped expanding .
don’t understand why a load for a lighter bullet requires more powder
Pressure and weight.
Pressure, it builds faster behind a heavier bullet and we cannot get as much of the same powder in without going over the max pressure for the caliber.
My apologies sir, I now realize that the gas can expand as much as it wants to even though the actual volume occupied by the gas hasn't increased.