The sellier and bellet you are finding is online?I have been using the PPU 180gr 10mm @ a little more than $19 a box for target practice. I do have some Armscorp and some SIG 10mm on hand but they are a bit more pricey. Sellier & Bellot can be found for around $15 a box
I have not shot anything too hot yet but will try different brands and loads. Eventually, when I have time in my life, I will get into reloading my own, which I have been saying now for the last 5 years. It will probably have to wait until I retire for good to get there though. For now, I will have fun with what I can find off the shelf.