"Uh!"
I am so sick of Professor Ignorance showing up to bury any serious discussion, whenever anyone starts talking about actual numbers, and engineering. It doesn't seem to matter what the discussion is about, "It's not rocket science!" Direct quote, even if we're talking about disabling ground vehicles in a SHTF situation.
Nothing to do with KB, BTW. Just a general rant about how easy it is to ruin the internet in the comments. If you know what you're talking about, or go into any detail, all they have to do is play the Over-simplification card. As if the simplest answer is ever the corect one. (No, that's not what Occam's Razor is. In fact, it was about experimental proceedure, not invalidating arguments on the internet.)
In this case, it was about a "Budget" .50 cal rifle. Single shot, but at $5.00 a round, if you're trying to save money, you're never going to put down the $250.00 minimum for 50 rounds, just to get good with it. So, the advice is to get an Antimateriel round, and shoot out the engine block, to disable, I'm just assuming a Technical trying to drive on your land.
Instead of spending a hell of a lot less on all-thread, and railroad ties to make Tank Traps, we'll just reccomend people buy a rifle they can't afford to shoot enough to Zero the damned thing. Good plan!