P
pacecil
Guest
I've decided to bring this up as a new thread considering all the hazards of dealing with an older thread on the same subject. To try and get this out of the weird discussions that develop in the other threads I'm putting some realistic numbers to it.
The water, or moisture content, in a normal 6PPC powder charge will be about .3 grains. This is all dissociated into hydrogen and oxygen upon firing and then some of it probably recombines back into water at the end of combustion. If the temperature of the gas left in the bore is cooled down then some of the water will condense out to coat the bore or it may form as drops of water in the bore. Typically the water that condenses would leave a coating on the bore about .00000000005 thick or a droplet .001 in diameter - or for example it might leave 3 or 4 drops .0007 in diameter.
It's possible also that the combustion gases would be cleared out and replaced with warm humid air and then this cooled down to further add moisture which again typically would double the amount left from the combustion gases. We could then end up with condensed moisture on the bore about .0000000001 thick or a number of droplets roughly .001 in diameter.
All this could reasonably be expected to happen if we had temperature changes of about 50F. With less change then less water would condense out of the gas or air. If you ran a patch through the bore it would pick up a coating of water about .0000000017 thick.
I leave it to the individual shooter to decide if he shoots in such a manner that this would happen, or to determine the effect of this amount of water on accuracy.
Oh, I forgot - if you want to apply this to rimfire, just reduce the numbers about 90%.
The water, or moisture content, in a normal 6PPC powder charge will be about .3 grains. This is all dissociated into hydrogen and oxygen upon firing and then some of it probably recombines back into water at the end of combustion. If the temperature of the gas left in the bore is cooled down then some of the water will condense out to coat the bore or it may form as drops of water in the bore. Typically the water that condenses would leave a coating on the bore about .00000000005 thick or a droplet .001 in diameter - or for example it might leave 3 or 4 drops .0007 in diameter.
It's possible also that the combustion gases would be cleared out and replaced with warm humid air and then this cooled down to further add moisture which again typically would double the amount left from the combustion gases. We could then end up with condensed moisture on the bore about .0000000001 thick or a number of droplets roughly .001 in diameter.
All this could reasonably be expected to happen if we had temperature changes of about 50F. With less change then less water would condense out of the gas or air. If you ran a patch through the bore it would pick up a coating of water about .0000000017 thick.
I leave it to the individual shooter to decide if he shoots in such a manner that this would happen, or to determine the effect of this amount of water on accuracy.
Oh, I forgot - if you want to apply this to rimfire, just reduce the numbers about 90%.
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