Mine have eaten every brand I have fed them....
Some brands leave more deposits ( are dirtier than others ),
don't remember which ones right off hand. ( prob Chinese or Russian manf )
Right now I'm shooting Smith & Wesson 180 gr. FMJ-FP and Federal 180 gr.
I have Hornady Custom 155 gr. XTP in my sub compact edc.
Stick with brass casings and you should be good to go....
Remember which manufacturer shoots better than others, and stick with them.
Yes. B-27 24x45 silhouettes. But don't get too hung up on that one right away. My suggestion would be to concentrate on shorter, more realistic ranges (still with the B-27) first. Please don't misunderstand my point. While longer range practice is a must, shorter range practice is also necessary.
Shorter range practice more closely resembles a more likely real life scenario, like for instance within your home or in a restaurant parking lot. And along with doing so, you're hopefully improving on both your firearm control and accuracy of shot placement. Both of which will contribute to improved longer range target acquisition.
I'm no expert. There's plenty of others here with a lifetime of firearms training under their belts who hopefully will weigh in.