Originally Posted by Doodaddy
I've done zero research on this, but I would think that there is a point of diminishing returns when it comes to increasing velocity as I think the bullet may just explode (for lack of a better word) upon impact not really transferring energy to the target.
While I rang ~22% of my impacts on rams, I was very shocked it wasn't more. I suppose it was luck of the draw on where I placed the shot. I wasn't really aiming for the higher portion of the animal, but really just trying to make contact. I wouldn't really want to commit to doing this any longer than it takes me to find the pistol cartridge rifle I want, but it's working for now.
I did a little bit of reading, and discovered the 42gr 1320fps Winchester Power Point Max made here in Australia has a stronger copper coating than other HV bullets to allow for the increase in pressure and velocity.
They also say the hollow point design is designed not to skid off hard surfaces (such as bone). I've seen good accuracy from this ammo in some rifles, including my own CZ 452. You can really hear and feel the difference between the max, standard and high velocity .22. Whether the extra weight is enough to consistently knock over pistol rams is another story. But it does have about 50% more muzzle energy than standard .22 and a slightly better BC projectile (about 5% over typical 40gr ammo I've read, though haven't confirmed).