Earlier I indicated that speed is not all that is needed. If you were to equate mass to zero and solve the KE equation for your speed, you would get o (zero) KE so it would be obvious that you need more than speed to obtain a penetrating momentum. To take an animal you MUST HAVE SOME MASS and SOME SPEED; this alone disproves your initial premise " Speed is all you need!(?). Put your numbers into the KE formula, equating the mass to zero and you come up with zero KE. Without some KE (aka momentum) you would have zero penetration.

You have a given speed and a given mass and together they provide a Momentum (aka Kinetic Energy) to penetrate an animal; and what you have works. Fundamentally to gain any penetration at all . . . Kinetic Energy MUST BE GREATER THAN ZERO.

The numbers you give yield 81.8 ft-lbs of Kinetic Energy (aka MOMENTUM). So regardless of what others say you do have sufficient momentum. 20 ft-lbs more than I do and I nearly always get passthroughs.