What do you suppose the energy difference at the target was, between the slow .177 and even slower .25? That, combined with the surface area of the pellet as it contacts the steel would be the determinants, I think. I wonder if even the pellet brand might make a difference, as in a softer (e.g. JSB) pellet might spread out its energy more across the target's face (therefore penetrating less), versus a harder (e.g. Crosman or H&N) holding its shape better (therefore penetrating more). Then again, that might be a minor variable.The only thing this shows is that much heavier 25 caliber pellets go through at a lower velocity than much lighter 177 caliber pellets.
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