I've used .25 Biovals and they seem to be really good quality and on par in terms of accuracy with any other brand (if not better) plus they are biodegradable so why not fertilize the soil while you airsoft?
Also pick up a bag of .28 bb's as they are supposed to have better accuracy when used with the correct fps and hopup. I haven't actually tried them so i cant really say much on that.
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