Pretty much a universal reloading rule - don't mix your brass. As long as you aren't hot rodding you will probably be OK. Although even with my hunting loads I batched my brass to get the most consistent results available. If you're loading near max you could tip over with different brands (sometimes even the same brand) having different case (charge) capacities and pressure outcomes.
Re loosing good brand brass out in the sticks. I never worried too much. More important to down the animal than worry where your empty went. Unless goat culling where some brass was inevitably lost, in which case I used older brass maybe nearing the end of its life.
I remember shooting a fallow, one shot kill, and going and finding it in the scrub, gutting out ready to carry, and then finding the fired case in my top pocket. I didn't remember putting it there after downing the animal. Bolt was closed on an empty chamber. So, my brain must have been conditioned to save my brass.
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