Why not? Stop talkin shit.

"A common misconception is that a 12-point socket is more likely to round off the corners of a nut or bolt than a 6-point socket. In fact, since the torque is applied at the corners of the fastener, the two sockets have the same number of contact points, apply the same amount of torque, and one is no more likely to round off the corners than another. Although extensive industry testing documents this fact[citation needed], the myth persists."

Number of Points (shape)

 

My Dad told me about this, he has years of experience wrenching (20 years) and I found the same results. When I used the 12 point with lots of torque I tend to round the bolts/nuts too.

 

sounds like user error

 

I've heard people rounding bolts using the open end of a wrench, but never with a 12 point vs a 6 point.

 

you round off that bolt/nut with a socket because it doesn't sit flat on it bc the cat pipe buldge is in the way. Closed end socket is really the only way to go with that. Put it on and give it a good smack.
If this does not work, heat the bitch up red hot, shock it with some water in a spray bottle, and then smack it again.
If problem persists, repeat above but get it hotter this time

 

Never use a 12pt socket unless It a 12pt bolt There should be no need for a 12pt socket if you have the right tools.

 

Turns out I didn't round the bolt off, I used a monkey wrench and Reapur used a longer socket and then just a regular breaker bar to get it off.