I have an assortment of 223/556 brass. I know the military brass is thicker. I want to use the thinnest brass to make 300 blackout shells. I've tried with military brass and can't get enough powder in one. I was thinking I could get a couple more grains in a commercial shell. Federal, Remington, Winchester. Just wondering if anyone knows which commercial brass to use for 300 blackout loads. I can load the military 223/556 brass on the low end to medium powder for plinking loads, even hunting loads for 223 for safety.
Thanks