In my Carl Gustav i have 44.5gr 2209 behind a 140gr SST doing 2710fps across the chrony. Projectile is seated 0.20" from the lands
43.5gr 2209 gave me a 4 shot average of 2650fps.
Both loads shoot about 1"
What model rifle do you have? I'd suggest starting at 42.5gr and working upwards.
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