Does my Winchester 70 in 35 Whelen count? It shoots 1MOA at 100 yards with my hand loads. Not sure where it would fit into an emergency plan, but I just like it….

There aren't very many things easier than convincing a man he needs another gun....

And I'd be lying if I said I hadn't considered some of these same reasons.

When we moved to our BOL 22 years ago, there was a lot of wide open spaces.  The classic "car rams the fence" scenario was played out. Some things to consider-

You would need to have the "special weapon" always in place and ready to go. I was able to get up to 30 MPH hauling arse down our rutted, bumpy flying off the seat while going this fast driveway. What is your field of view? Can you SEE this coming far enough out? Depending on your driveway length, you may only have 5-10 seconds. That means your Lapua, BMG, etc. has to be out, loaded, setup and you need to be ON IT immediately.

I almost wrecked an old Chevy truck checking that speed a couple times BTW. To be young and dumb again...

So we had put in a couple turns at key points, those certainly slowed things down. A slight "dip" of a couple feet in the driveway made the truck catch air and I mentally heard the Dukes of Hazard theme music playing while I was off the seat briefly...

So most farm fences will not stand up to a truck ramming them. - wood posts and metal T posts with 4' wire plus a string of barbed on top which is about the most you can get away with in the country without screaming "I have something you want!"

One day I watched a little Mexican gal cut a corner waaay to quick on the road and slam an S10 into a telephone pole, I would guess she was doing 30 MPH. The pole barely shook but the truck was immediately fubar.   So we ran with this idea and took old telephone poles and cut them into 6' sections and buried them 4' in the ground leaving 2' out of the ground. We put these about 10 yards in front of the farm fence. You would be tempted to just make them part of the farm fence but they really need to stop a vehicle before the fence is damaged IMO.  I also tried some smaller wood "corner posts" of approximately 8" diameter that you can find at most hardware stores for "corner posts" in fence construction. Space them out just less than a car width.

I got the old Chevy up to 20 MPH and ran into the cut poles. Thankfully the old truck didn't have air bags... The cut poles stopped the truck and left a helluva dent in the bumper.  Then I tried it again using my backhoe. Backhoe didn't get the same speed up and honestly I didn't check the speed but I angled the bucket where it would "cut" the poles. The telephone pole pieces were not cut but had a helluva goowge (sp) in them but they held. The hardware store "corner post" snapped like a breadstick from the backhoe bucket so we never used those again.  

Why cut poles? Usually you see people who just regurgitate stupid crap they have read but never tried mention "putting boulders" or "old cars" for use in this manner. Think about it- boulders, old cars offer some cover and concealment.  A two foot high, maybe 16" wide pole isn't give anyone cover or concealment. It's kinda like the "grow brambles in your fence" non sense that people regurgitate- brambles aren't really going to stop someone but they will add concealment for someone sneaking in... There is a reason fence lines at prisons, bases, etc. are kept clean- for good sight lines.

Also- aesthetics. Cut poles can be made into a BS decorative fence, painted, etc. Old car stacked everywhere just makes your place look like Sanford and Son's...

The cheapest but longest taking is growing trees as bollasts.

All of this certainly isn't as fun as buying an M82A1 but it is a lot cheaper