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Using Missouri Bullet IDP #4-XD 200gr RN in my 45 ACP 5" Kimber. Started at published low of 4.4gr and worked up to 5.3gr and I feel like I am getting low velocity. 5.3gr got me an average of 791. I was hoping for something closer to 850 as this is a 18bhn bullet meant for major PF. OAL was 1.225". Should I try shortening OAL to increase velocity?