[@BigPapaBelial]

[quote=@BigPapaBelial]
No real reason. So what if it's fresh brass or used brass? It's not the matter of if it's shiny and new, it's the matter of what it does in the end. 
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'Cause the old stuff is used and worn and more likely to be structurally compromised?

[quote=@BigPapaBelial]
That being a wildcat 5.56 or 7.62 bullet. With maybe 80 to 120 extra grains of propellant, which really doesn't sound like much, but can make all the difference in the world. What goes from a 2 inch hole in a wall, will become a 6 inch hole in that wall, and the the corrugated steel behind it, and punches through the two guys behind that steel as well.
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Dude

That's an [i]insane[/i] amount. The maximum safe amount of powder for a 5.56 is somewhere around 25 grains, and for a .308 it'd be in the 40-50 range. 

You're gonna blow up your gun in your face if you cram an extra 80 grains of powder into either bullet, in the case of the 5.56 that's more than three times how it can safely hold! To say nothing of 120 grains! And with .308 you're still doubling how much powder's in there with 80, and tripling it with 120!

You're also assuming that a standard round isn't going to fragment or yaw violently if it doesn't just fall apart when it hits that door or the corrugated steel behind it.

Wildcat is a custom cartridge that you're not gonna find in Billy Bob's Gun Parlor, and handloads (which is what you're actually talking about, unless I missed something here and you're making custom cases and bullets) aren't supposed to be bombs.