I think the heavy bullets are a good idea for the pins, especially if the bullets have a big meplat, ( flat point on the end of the bullet ), I just know if you kick them up to 1200 fps, the muzzle flip is going to get your attention. You don't want to penetrate the pin, that is lost energy.
On a side note, looking through my loading manuals for you, I found my " Principles of personal defense " by Jeff Cooper, that little book disappears for yrs at a time, thanks.