Well, that depends on the gun type. For my 1911 (semi-auto) carry piece, I got 400 rounds of a lot of different types of hollow points (for summer carry). I got Corbons +P HPs, Winchester silvertips, Winchester white box HPs, and hydrashoks. I did not manage to make the gun choke once on any of these loads, so none of them were disqualified by that criteria. So, I picked the one that did the most damage to my targets (fruit and wood) and that I had the most accuracy with.
That was the Cor-Bon 185 gr. JHP 45 ACP+Ps.
When I can find them around here (or I can order some with my next C&R shipment..) I will be trying some PowrBall ammo and Gold Dots to compare. I usually carry FMJ in the winter for penetration purposes, but the PowrBall may be my new choice come this winter if I like it.
For revolvers, less ammo is needed to test for reliablility. Basically, if it ejects easy it is okay to use. I tend to carry my Model 10 as my beater gun, (as the finish is long gone) loaded either with Winchester 125 gr. 38sp+Ps, 158 gr. LSWCHP, or straight up 150gr. lead. (depending on the weather, and therefore what type of clothing I would have to shoot through)
Don't just go make an ammo choice for semi-auto carrying based on hype. You NEED to make sure it doesn't jam up your gun, and that you can shoot accurately with it. 2 guns of the same make and model can have completely different preferences when it comes to ammo. It's kind of like shotgun ammo patterning in that regard. You're betting your life on your ammo choice. Spend the money to make sure you make the right choice. Carry ammo isn't cheap for non-reloaders, but your life is priceless.
Best Regards,
Chip Dixon