Or, you can go heavy, and use the weight of a heavier bullet to get the necessary penetration, and maybe get expansion, or..
just go for penetration and be happy with knowing its gonna at least bore a hole where its aimed.
Seems as though within the parameters of usable handgun ammo, the larger section of the heavier bullet will be more effective. Once you leave the confines of handgun ammo, then some things change. However, even with handgun ammo shot placement can be drastically effected by recoil. Another factor. That may lead a person to limit the weight of the bullet. Sounds like each person will have to shoot some ammo and stay withing the parameters of conventional thinking about ammo, i.e. .38 - .45 in the proper weight ranges for each caliber. I'm grateful for the experience of others on this and other forums and don't hesitate to take their advice when it forms a consensus.
Rollo - The real issue for you is this...
If you're going to carry your SP101, you might as well carry your G26 with more than twice the ammo load.
If you want a handgun that weighs less than the G26, do consider the Ruger LCR. Given your luck, I'd stay away from the alloy J frame.
As far as ammo goes, I like heavy for caliber.
This months American Rifleman has a very good article on stoping power. The Author a "jello Junkie" of sorts sites expansion penatration & velocity. In his testing bullet design plays a primary role.
The 9mm & .40 fair well much better than my fav. the .45 acp! So never having been attacked by blocks of jello I have my doubts about his findings in a "real world" setting". It is however for guys like us a good read.
Personally, I like heavy loads.
I'm no professional, nor am I that well versed in ballistics. But, I- for one- think that a sledgehammer moving a little on the slow side does more damage than a carpenter's hammer moving a little faster.
Also, the heavier bullet is more likely to retain it's weight/mass than a lighter one. While a bunch of little bits of bullet going everywhere (i.e. 'Glazer') is a pretty awesome idea, I like it. It's like tunneling into a mountain and digging a bunch of tunnels to make it collapse into itself. But, I really prefer just blasting it into a massive crater. :image035:
I will say this though. I am lucky in that I am in what I consider to be a good position. I have 2 reliable guns that I can carry that I have faith in. The SP101 and the G26. I was just looking find something a bit lighter and smaller for t-shirt carry.