Jeff Siewert

Okay.

So this slide is a slide that shows the relative bolt load

for four different cartridge cases.

The yellow diagonal line is 556 with a brass case.

The gray line is an aluminum case.

The blue line is a steel case.

And way up at the top under the red dashed line is a polymer case.

with a polymer body with a brass base on it, okay?

And so you've got lines on there for a wet or lubricated cartridge case.

And so anytime you lubricate it,

your bolt loads are going to go up.

That's just the fact of life, okay?

You've got a vertical line for dry, and that would be, you know, you've inserted the cartridge case into the chamber.

It's completely free of any fluids, lubricants, water, etc.,

And then over on the far right-hand side is a dirty cartridge case.

So this would be a cartridge case that's contaminated with some sort of high-friction dust or dirt, something like that.

And so it just gives you an idea of how the different cartridge cases behave.

And so from a gun design standpoint,

what the gun designers use is just the pressure times the area acting on the base of the of the interior of the cartridge case and that polymer case you can see you don't get a whole lot of relief um as a result of having so um for this for this exercise this assessment

I held the peak pressure at 52.5 thousand PSI.