Some of the Rollers I have made... Just testing their penetration.... Accuracy is spot on but in these videos I am shooting all over the target in order to avoid shooting in the same holes made by previous shots.
Please note that the target consists of 3x4cm (Total 12cm) hard blue insulation boards that are held together with a couple of layers of tough see-through packaging tape. The target cannot be penetrated by pushing the spear shaft by hand.
If I were to put two boards without the tape we would surely have penetration at 6.5m or even 7m

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