I don't have listing for 87 VMax in 6BR in my books. I have a 27" 8T Wilson barrel (lightly used Urbanrifleman barrel) and virgin Lapua brass with CCI 450 primers. Want to do intial ladder test at 300 with .5 gr increments with Varget. What would be my maximum listed charge and good starting charge? Please, no other powder recommendations at this point.