There's a point in which the weight of the arrow slows it down so much that you will lose kinetic energy.
While 25 grains isn't that much, it is possible to derive more penetration by moving the weight back in the shaft instead of having so much weight in the front. The heavier heads are intended to balance out a heavier shaft.
I feel certain their are formulas available to help determine theoretical penetration, but you're really kind of getting into an area where it doesn't matter that much. You're probably not going to penetrate both shoulders with that bow at that poundage no matter what head you use, but if you hit just ribs, you'll likely blow through both sides and find your arrow in the grass no matter the weight of the head.
Sometimes we get caught up on KE and penetration when it simply doesn't fit as well as does shot placement. We'd be far better off worrying about shot placement than anything else.
While 25 grains isn't that much, it is possible to derive more penetration by moving the weight back in the shaft instead of having so much weight in the front. The heavier heads are intended to balance out a heavier shaft.
I feel certain their are formulas available to help determine theoretical penetration, but you're really kind of getting into an area where it doesn't matter that much. You're probably not going to penetrate both shoulders with that bow at that poundage no matter what head you use, but if you hit just ribs, you'll likely blow through both sides and find your arrow in the grass no matter the weight of the head.
Sometimes we get caught up on KE and penetration when it simply doesn't fit as well as does shot placement. We'd be far better off worrying about shot placement than anything else.
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