I would pick out a popular one like the 200gr SWC or similar, load them up over some Unique or AA-5, or maybe even Bullseye, and go try them out. Just keep in mind you can get leading for several reasons. Usually the biggest with commercial bullets is the alloy is too hard for the loads being used. With the 45 ACP you shouldn't need anything harder than around a 12 BHN, but could probably get by with something around a 14 BHN. Softer in this caliber works well due to the low pressure and velocity loads used. The other issue would be the lube quality. That said though most commercial lubes are OK to say the least but are usually hard to enable them to stay put on the bullets during shipping. This is sometimes a good thing but can be their downfall. The folks form Missouri Bullets seem to have a great following, even though I DO have some of their products I haven't had the chance to try them out yet. Been too busy with my own for the time being.
As to what leading looks like, well if your barrel looks like this after 5, 10, or even 100+ rounds like this one has through it, your good to go,
On the other hand if after 5, 10, or more rounds it looks like this, you should reconsider your alloy choice or your load,
This was after only 4 rounds, but I was testing out a soft alloy at a pressure level I knew would probably result in this. However you have to test things out with cast or you might not find something that really works well. Turns out after further testing this was mainly due to two things, first the lube simply wasn't right for this project, and secondly the powder used was not quite right either, too much pressure too fast. I changed the lube and powder coated some just for kicks, and changed to AA-9 for the powder. I worked both the coated and conventional lubed bullets up to the max listed charge weight for this weight bullet with no issues what so ever. After firing a total of 50 rounds, the barrel looked as good or actually better than the top pic. However that one had well over a hundred rounds through it when that pic was taken, and quite a few more before I actually scrubbed it out.