I put Double Tap in my guns. I figure if I'm going to need it, chances are, it is going to be dark and I won't want a lot of flash. I know that UMC JHPs will work just fine in my guns, but they flash a lot in comparison. In the short barrel 45, that's RNFPs. In the wife's 9mm, that's Gold Dots.
In my reloading tests, I've had the gold dots plug the point and not expand in 230 grainers, they were filled with wood target backing material. Admittedly, these were not the short barrel JHPs. This is unsettling to me in such a "premium" bullet, but it shows how tough this bullet really is. The ones that did expand, expanded fully. Hornaday XTPs, both 180 and 230 flavors, have always expanded. I have never found one not expanded. I have found a couple that had the lead separate from the copper jacket.
I'm not particularly brand loyal as these two Taurus guns my wife and I have eat everything we've ever put through them without issue, FMJ, JHP, SWC and so on, everything. But, we as gun owners have to to admit, most goblins, statistically, do their work at night. So this flash issue probably my biggest concern when considering my carry ammo, not the pill driven by said propellant. It is considered, obviously, but I'm more interested in low flash than the latest uber bullet some gun rag who recieives advertising money from the same company purports as the next greatest thing.