Good question and much more fun than paper. As suggested if Ali express doesn't work out just a small off cut of steel plate from the local engineering shop. 4 to 6 inch's max. I hung mine under a bent electric fence batton.
Get's a real good ring and jumps around, quiet satisfying and very good practice for technique and getting to know both your rifle and a caliber.
Cheap to practice and get some wind blowing and mate it's amazing to see what it takes to ring the gong.
I got heavier plate as it was also used out to 300 mtrs with a 223 so covered a few different rifles.
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