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Originally Posted by Salavee
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Great read! Confirms everything, not sure where you’re headed with this?
As I said elsewhere, there is an exponential factor in penetration, the faster you hit something the faster it slows down in proportions far greater than the difference in velocity, momentum etc. Heavier arrow with same momentum will be going slower than lighter arrow with same momentum. So the lighter arrow doesn’t go as deep because it was met with 7x the resistance due to added velocity.
My terminology for same thing is...faster you hit it faster it stops, slower you hit it slower it stops.
So same arrow momentum went deeper with heavier arrow. Same momentum means same energy, or same bow or same cartidge two different bullet weights. The heavier one goes deeper even though slower...because it’s met with less resistance AND it’s heavier for same frontal area...higher sd. And since we talk about impact velocities same that rules out momentum as a useless figure. Over and over proven that something like a 6.5 Swede with 160’s and approx. .33 sd will out penetrate just about everything else with much higher momentum figures. Because momentum doesn’t mean anything. The is a threshold and efficiency in high sd bullets at certain velocity ranges that work beyond expectation or even belief. We covered this before, momentum isn’t a factor you can count on. It’s there but it doesn’t matter, that’s all it’s got. When those two arrows from same bow and the slower heavier one goes deeper, it does so because it’s higher sd. End of story...for the twelfth time.