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Understanding meteor impacts...

 ...or high-powered rifle bullets on rolled steel armor plate.  Pretty much same-same except the plate is tougher than the surface of the moon.  Though, I dunno.  In scale, the craters in the target plate might actually be *deeper*...

High power rifle bullet impacts on steel armor plate.

The pic embiggens.

More of the trauma for the targetry...


Ouch, may have to start checking the ammo fired on the range or back it off to 200.  Cratering on the armor plate is not a good thing unless you have the kind of coin it takes to replace targets after a few years.  If you use the same cratered target for pistol at 25m you now have a the danger of splash back, but the Armorer already knows that.
Sadly, there's no backing off to 200 meters in the current configuration.  The change is going to be no shooting 30.06 at those targets at that range. The vendor says 100m would be sufficient stand-off, that only appears to be true for gas guns. 

That shot-up support leg was me, shooting your buffalo gun, JW.  I had the sense I was going low from the sound of it - but I thought I was hitting the splash plate.  My deflection was consistent...
And I'm not comfortable shooting pistols at those targets even at 25m, which is an excess of caution perhaps.  The targets can be adjusted to increase the forward lean to better ensure deflection of the bullets to the ground.
I wouldn't use steel targets at 25M with large bore weapons. .22, I would, but otherwise,  paper works fine even if it doesn't react like the steel targets. I think maintenance of one's original bilateral symmetry is quite important in insuring availability for future fun activities.
It's a very good caution, John.  I have not seen .22 hit a steel target and ricochet back to the firing line, but I've heard of it, and seen scarred posts on the line.
I've seen .50 bounce back to the parking lot; of course they were firing them on the 25-meter range for some reason. And I've seen grenade levers, twisted and perforated, land on the canvas of jeep tops parked nearby. Those were good places to not be, especially the first one. It got a cease-fire for the duration.
There was a time when I used to make craters for a living. When I was a NASA co-op at MSFC, I made up hand loads for a 1/8" Boeing Light Gas Gun, with muzzle velocity of about 10 kilometers/second.  At that velocity, even a light plastic pellet will make a crater in _anything_ .  Of course, we had to pull a vacuum on the target chamber to get that kind of velocity.  We were testing samples of the meteoroid protection curtain on Skylab, IIRC.
My .45-90?  540grains of cast lead at 1300 fps might have, but I'm guessing it was something that was moving a lot faster.  The guys on the BPCR range get grader blade edges and use them for bases.  Edge on they are narrow and it is tough steel.  You may have to talk to your friends at the county shop.