I run 147grn Extreme RN copper using 3.6 grns of VV 320 OAL 1.120 in my Foxtrot Mike 7"upper and 9"upper SBR suppressed about 920fps with a PF of around 134,also works well with my Scorpion Micro pistol with 5" barrel suppressed same PF. This load shoots very soft and quiet even when not suppressed