The Woodleigh Hydro's are designed as a "Cup Point" type solid, not a true deep diving penetration solid like the Cutting Edge and North Fork's you see above. A Cup Point solid has a slightly dished out Meplat, this produces a larger surface area that comes in contact with the Terminal medium. This larger surface area fools the Terminal Medium into believing it is actually a larger diameter than it really is. It causes more tissue damage than a Flat Nose solid, but because of the larger surface area in contact with the Terminal Medium it does not, will not penetrate as DEEP as a real solid. As you see in the direct comparisons above.
It is BETWEEN a Real Solid for deep penetration and a Trauma inflicting bullet, such as a Raptor or Conventional Soft point. North Fork first produced the CPS, Cup Point Solids many years ago, long before Woodleigh.
You can see the dished out meplat............. The top two have been fired and recovered, the bottom one is unfired......... The Woodleigh is nearly the same as this, very slight disruption in Terminal Medium, including Animal Tissue.
North Fork designed a couple of "Expanding CPS" bullets for the 45/70s, and they are extremely impressive, so much so that John, one of the owners of North Fork, and I designed several of these Expanding CPS for the B&M Cartridges in .500 caliber, that actually expand..........
The Woodleighs do a very good job and are good options where you want more penetration than a standard Expanding or Trauma Inflicting bullet. But they are not true solids when it comes to "Deep Penetration" as you can see in the tests done above.
They are not as good as a Deep Diving Solid, and they don't produce as much trauma as a Conventional Premium Expanding bullet, or Non Conventional Raptor...... Kinda neither here nor there, but in Between.