Jeff Siewert

determining factor, but kind of with equal schedules, you'd expect the barrel to not last as long using a double base pellet.

And I guess I can't tell you what the relative life ought to be.

Right, right.

Absolutely.

So if there are no questions here, we'll trudge onward.

Okay, so this is a little graph I put together that shows the surface area to volume ratio as a function of the web size.

So the web dimension is the physical feature on the propellant grain, the smallest one that needs to be burned.

in order for the propellant to be completely consumed.

And so if you look at the different propellant geometries that are out there, there are flake powders, ball powders, tubular powders, they kind of fall into groups.

Okay, so the flake powders are on the left-hand side.

You know, they tend to be typically very small web because their usage is in low-pressure items like pistols and shotguns, and ball powders and extruded powders or tubular powders are used in much higher-pressure systems.

And this graph is all...

keyed by the different propellant manufacturers that produce powder.

There's St.

Mark's, there's IMR, Alliant, Norma, and Hodgson.

So they're all in here.

And obviously the peak pressure affects the choice of the powder.

And in order for us to get the muzzle velocity as high as possible,

You need to run pressures to the upper limits of the firearm design.

So let's just say that the design working pressure is 60,000 PSI.