For less than the cost of most new upmarket guns, you can get into reloading. PPs have hit the nail on the head; the issue is throweight. It's still cheaper to reload 9s, but not by much, but the big boys get pricey.
As regards point of impact, so much of the variance is in how the gun recoils. You're probably better served compensating for the difference than trying to match it among loads.
Moon