Jeff Siewert

For 300 blackout, it's just horrible.

It's like there's two different populations.

And I attribute that to the,

propellant being able to wander around in the cartridge case during the ignition and combustion phases.

So one of the things you might think about doing with a cartridge like the 300 Blackout, if the cartridge case is not filled, I mean, I'm talking if it's less than like 90% filled,

You might think about putting in some sort of an inert filler.

We've successfully used baby cereal, dried baby cereal in the past.

Cotton batting might do you okay.

Yeah, just something to restrain the...

propellant during the ignition and early combustion phases all right okay uh he says the one inch group for most groups but the sw black performed worst best group is 1.75 yeah so one of the things you got to worry about particularly with 300 blackout it tends to run at lower chamber pressures than others

which means the propellant burnout is going to be kind of much more difficult to achieve.

I would suggest that he look at powders that are kind of closer to the faster relative quickness side of what's acceptable to load.

Yeah.

So one of the things that you could do is to make yourself a little frame out of some pretty hefty plywood and

either bolt it or clamp it or weight it to the bench that you're on and cut a little hole in it for the bullet to fly through.

And then staple some white cardboard to the face of it facing the gun.

And if you have a muzzle brake or a suppressor or something like that, take that thing the hell off and then fire through that hole in the plywood.

And you're looking for

little divots in the white cardboard to tell you whether or not the propellant's burned out.

So if you see a lot of divots in the plywood, not the plywood, in the white cardboard, that indicates that the propellant is not burning out and you want to probably switch and move to something