50BMG barrel blank.
grabcad
Human: I'm using a blank rifle barrel with a twist rate of 1 in 15 inches and a diameter of .66 inches for the grooves, .33 inches for the lands. The barrel is 30 inches long and has 8 grooves, with .500 inch wide lands and .510 inch wide grooves. If you want to change the twist rate, just modify the helix accordingly. Let me know if you'd prefer a different file format. Hello!
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