Lets just say that the 240 is a smaller dia hollow point.
It was not a total cookie cutter hole, it had some jagged edges.
To further illustrate this, those unmentionables are known for blowing big holes in deer and/or overexpansion. Whereas the Maxi Balls were hard cast and all the critters I have ever put one through puts a .50 caliber hole coming and going. That is until solid bone is hit. The amount of damage they do then is unbelievable. I suppose I should have mentioned that.
Now to even further prove this, lets go back to the other unmentionable. It was a 300 grain made of another alloy and is an extreme hollow point. So much so that many people will not use them and they are not known for penetration. Even the manufacturer states this. It was traveling faster than the Maxis, made of thinner extreme hollow point, same bore diameter, but did not do near the damage in the metal as the Maxis did. All were shot with the same powder charge from 100 yards.
Considering the above, one can only come to the conclusion that it is a larger, slower, heavier projectile that is most damaging on critters, even if they do not expand.
There is some very good ML penetration tests on Youtube by I Love Muzzleloaders. He shoots different ML projectiles into lined up water jugs. All with the same .50 ML from 100 yards. All with the same charge. Out of many different projectiles he tests, the average ones penetrate about 4 to maybe 5 jugs. He shot a 500 grain conical using the same powder charge. It destroyed and went through 9 jugs. About double the other ones did. And that particular one did have some expansion.
Indeed, there is something about a heavier ML projectile that is no doubt traveling slower that is superior upon impact.