Idiot blew his leg off

[brewer]

Yep, this guy is an idiot. All of 43 feet away with 3 pounds of explosive.

I didn't watch.  I don't enjoy injuries to idiots, deserving or not.

What I wondered was:
Forty three feet: didn't he trust his marksmanship?
Or was this all the accuracy he could expect from his weapon.

So we have a poor shooter with a questionable gun who is in the lower Duning Kruger tail to begin with.
Anybody else worried about elevated danger for the rest of us?

This shooter had multiple issues.

1. To close to the explosive. 100yds/lb minimum. They had 3lbs, minimum should have been 300 yards. And that's for open explosive generating no shrapnel.
2. No scope. For a practiced shooter with an AR15 (that is what he was shooting) hitting a 3lb tannerite size target (assuming he used the containers the manufacturer sells) at 300 yds with no scope would have been no problem. Might take a few shots to zero in the target without a scope but it can be done. This guy was not taking the time to make an accurate shot. Just pulling the trigger in quick succession hoping to hit the target. My guess is that this guy needed more target practice time or a scope.
3. Obstructed explosive target. From the video it looks like they put the explosive behind something on the mower. That explains why he moved to the side to hit the target. The AR15 uses a .223 cartridge. The bullet it's self is relatively small (compared to other rounds) with limited penetration. Even a piece of sheet metal on the mower engine cover/cowling could have decreased the speed enough so that the explosive would not detonate. The manufacturer states that the round needs to travel at or in excess of 2000 feet per second.

Edit: Forgot to mention that he was using an assault rifle, not a target/hunting/sniper rifle.