I would like to see some actual pressure information, not "estimated". Bullet velocity is not a good way to determine pressure.
Agreed Jim.
that’s the topic I eluded to earlier in one of my posts . Just because your under 1000 or 110ftps , Doesn’t necessarily mean you have a lower pressure in the areas that count .
Same goes for size of round . Just because your shooting a smaller bore doesn’t mean there is less pressure . In fact it can be just the opposite.
I think however we do have to Not compare apples an Oranges as we concern ourselves with pressure . IE , while a 357 hot load will subject the cylinder in a revolver to the same pressures as a chambered round in an Auto , the revolver will not produce the same barrel pressures as that Auto .
The reasoning behind that is that pressure moves to the point of least resistance .
With a revolver , assuming everything is in proper condition , that point is the cylinder gap. Now that’s not to say that the barrel is not subject to pressure because it is . However that pressure is the result of what exceeds the amount escaping the cylinder . In other words the pressure builds faster then it can escape
Example ; vent on a flintlock .
So once again we are back to the design of the given application . Thus we are back to the question of can the design withstand the application ?
Well we know the cylinders on these conversions do when the advise of the manufactures are followed .
Which brings up the whole topic of powders , which again is apples and oranges and why I said ; it depends . You don’t just start loading powder in casings because what may produce a suitable load at 4.3 grains of A.S wouldn’t be suitable when using Unique .
that’s what we are doing when we try and compare BP to smokless as they react in most cases completely different
Black Powder is not slow burning . If a one were to lay a line of black powder next to a line of smokless . I don’t care if that line is 3ft or 2000ft , the line of black will go up near instantaneously . Where the line of smokless will sizzle , pop resulting in the fuse effect that you often see supposed BP do in the movies .
However , Contain that smokless powder. Give it some air space so that gases can build and you get a completely different result with a longer pressure curve that are often still building as the projectile is moving vs. BP which is often diminishing . Thus why , as you stated Explosive vs. propellant .