Either of BM or 8208, when in the 24- 24.5 gr range, vertical dispersion will be 2-4" through 5 slow fire, have not shot fast enough for barrel to be more than slightly warm. I have not seen any brass length change, I ran some through full length 223 die, seems only slight body sizing occurred. Did Not have to bump shoulder back for brass to chamber. Receiver not trued, this is first custom barrel that I have had such flakey testing. Powder lot I'm working out of has performed at "book" velocity out of several other rifles. I may have to test above 25.5 gr, with the chronograph, and see if I can hit a flat .5 gr node.
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