I do most of my practice with some form of 130gr FMJ, currently using PMC 132gr FMJ. 148gr WC is also a good practice option. 158gr LRN or SWC is another good option for practice ammo, especially if you're using 158gr loads for carry/self defense use.
I will shoot +P occasionally. My carry load is Speer 135gr Short-Barrel Gold Dot +P, and I have some Speer Lawman 158gr TMJ +P for +P practice. I usually try to shoot a few cylinder-fulls of +P at the range. The 442-1 is rated for +P, so I wouldn't worry too much about running some +P through it on occasion. A steady diet, not so much.
If you can handle Buffalo Bore 158gr LSWCHP standard pressure loads, you should be able to handle +P from other makers, based on my experience. It's still a fine carry load and is my preferred version of the FBI load, and my second favorite choice, after the Speer SB-GDHP. I have a box or two that I like to keep on hand. If you like them, and can get enough to keep on hand, it's a good choice, in my opinion. Just find one of the standard pressure options I mentioned for most of your practice at the range.
For standard pressure defensive loads, my favorite is Federal 125gr Nyclad HP, but they're no longer made. I'm still hoarding the 2 or 3 boxes I have left. Hornady offers some standard pressure Critical Defense loads, but I'm not that familiar with them. I have seen people recommend them. Winchester Defend 130gr JHP looks promising. Can be hard to find, though. Even before the current ammo availability situation I could never find any in stock whenever I've gone looking for them.
As Rpg said, 148gr WC can also make for a decent self defense load as well as a practice load. It has the potential to cut a full-caliber wound channel and from the data I've seen is not likely to pose an overpenetration risk like other non-HP bullets. I've got half-a-box of it on hand as a low recoil carry option. It's only downside is that it can be difficult to reload under stress, but for the most part, reloading in the middle of a gunfight is very unlikely, so I would practice it, but not worry about it too much. You could always carry BB ammo, or some other HP ammo, as reloads.
To sum up, my suggestion would be to hold onto your BB ammo for carry use and look for whatever standard pressure practice ammo you can find. 148gr WC would be a good choice as it can also serve as defensive ammo. Given our current ammo availability situation, you may just have to settle for whatever you can get and do the best you can with it. Regardless of bullet type, shot placement is still the most important factor.
Just my opinion.
