X2. The amount of energy needed to crater that plate is huge. I wouldn't shoot 7.62x54 at mild steel plate that's for sure.
This mild steel plate didn't really produce sharp crater edges, except for the hits along the gong edge as you can see. The craters had round-ish dull edges. Material was obviously missing from the gong surface, that material went somewhere. It's extremely important the gong can swing freely deflecting exploding material down to the ground. I also made the gongs hang at an angle pointing down to help control the shrapnel deflection. Our setup was effective in directing shrapnel down to the ground. The ground was completely shredded.
Another note, the gongs I made are small, 5" square. I used rebar as a hanger material... I do not recommend this. Rebar is cast steel. Cast steel shatters and cracks. Some of the gong hangers were cracked and snapped from indirect impact That's how much energy a 7.62x39 round produces. We were really surprised at the damage. The plate I posted is actually bent from direct impact.
This mild steel plate didn't really produce sharp crater edges, except for the hits along the gong edge as you can see. The craters had round-ish dull edges. Material was obviously missing from the gong surface, that material went somewhere. It's extremely important the gong can swing freely deflecting exploding material down to the ground. I also made the gongs hang at an angle pointing down to help control the shrapnel deflection. Our setup was effective in directing shrapnel down to the ground. The ground was completely shredded.
Another note, the gongs I made are small, 5" square. I used rebar as a hanger material... I do not recommend this. Rebar is cast steel. Cast steel shatters and cracks. Some of the gong hangers were cracked and snapped from indirect impact That's how much energy a 7.62x39 round produces. We were really surprised at the damage. The plate I posted is actually bent from direct impact.