Whichever brass the rifle likes best.
I find a more consistent accuracy with Federal and longer lasting with Remington. I get more reloads with Remington with neck sizing & annealing.
Your statement about not being able to find any pretty much sums it up. You're a new reloader so grab what you can, when you can & have a go of it.
After you're a bit more experienced, then look for what "works" best.
Just a few tid bits of info from yer 'ol Uncle frank...
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