If you want a quick way to blow your face off, "the anarchist cookbook" is a good place to start.
What I would do is build a pneumatic powered gun, and home press half sticks of dynamite with a shotgun shell press, then light the half stick, and shoot it out of the gun with air power. Way cooler, and safer than a modern firearm.
Modern firearms are dangerous! The good thing is bears like cooked food, when this pipe bomb explodes you will instantly become a nice medium rare. If the bear is lucky your nerves will have your body flopping around for a minute or so, he'll think it's a live snack. If explosion takes your head completely off your body the bear will loose interest, not to worry though because the coyotes will love scavenging human bits from your lawn. When you do fire, please make sure you're standing on your concrete driveway, you wouldn't want to start a forest fire.
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Please explain how it would explode in my face? I am firing a projectile with the a barrel of the correct bore size, with strong steel that is thicker than most firearms with black powder. I am not trying to make a firearm out of wood and using tnt for the propellent.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent