LOS bullets are plated, not jacketed. They are adequate for plinking. Use data for cast bullets, keeps the velocity a little lower which is preferred in plated. I have previously found inconsistencies with these, my last lot had bullets keyholing.

Powders wise, you’ll be well served with Vectan. I imagine you should never have supply issues that you can get with US powders. BA9 1/2 is a multi use powder covering lots of cartridges and loads.

Personally I believe when you’re learning, you need the best components and ammunition that you can assemble/obtain. As you’ll know, ammunition performance can vary greatly, and if that variable is removed you’ll know that you are chasing your skill level and not taking negatives from poor performance of the ammo.