Somebody had to break those rules or no one would know what to expect.Lots of back and forth, lots of opions on this.
Shooting mild steel in general isn't a great idea from a safety standpoint.
Know your target and beyond is one of the basic rules. If you don't know what your bullet is going to do when it hits a target at whatever range, velocity, angle,fixed or not, your breaking rules my 11 year old kid wouldn't break. If you don't know what happens when you hit the target, you don't know your target.
Normally I would disagree with this statement. You can heat-treat most steel alloys at home if you've educated yourself on the topic and you're not trying to do or work with something exotic. Look up the Gingery Bros. books on amazon, there's likely one that covers this. However, with the large sections being discussed the odds of someone at home having the means to get that much mass up to the temperature(s) required isn't all that likely.........
Don't try to harden the steel yourself, its not going to happen, zero chance of that.
They made some welding rods for hard facing earth moving equipment blade edges. Wonder how that would work on a target face? Don’t know if they still make them or if it would be economically feasible.
That was my guess, but no practical experience with any of them.I have tried Lawson Cronatron 7355 and also overlay plate. They were too brittle. They are more of a high abrasion low impact carbide material. Cronatron 777 Austenitic might work. I have not had an opportunity to try it though.
0 There were one or two other alloys available, but my need for 10 gauge max thickness means that I've forgotten all that weren't offered that thin. I've got to think that the whole HSLA market has changed considerably since then.
I know at my range the RSO will ask you what grade of steel and it's rating before allowing the use of any steel targets.Until proven sufficiently hard, I would not use any caliber of high vel rifle on this at 100yds. Pistol calibers will be ok and lower vel rifles. I have shot holes through 1/2-5/8" railroad bedding plates with 22/250, 243, 6mm, 25-06 etc, and even won a bet in the 80's by shooting a 130gr 270W and 168gr 30-06 through a piece of 5/8" cold roll steel.
As long as a sufficient type bullet is used, Velocity is the key.
At my old club, I saw mild 1" plates become rifle cratered rather quickly, and bullet fragments ricochet every which way. And a 5 piece set of 1/2" dueling pistol plates become destroyed by a couple of misfits using old 7.62x54R steel jacketed ammo.
That said, your purchase is very cheap, so use your best judgement and safety.