Try these slugs bud, AVS 3033 in 60g, 64g as well as AVS 3063 in 55g, 60g These should hepl close that spread.
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My Vulcan 3 700 in. 30 Cal is shooting the JSB 50.1 grain at 913 fps with the regulator in the rear side. I notice that with the regulator in the front side the o'rings get marked and would leak soon.It would be interesting to see what a 30 cal v3, would do with the plenum in the lower power side, what it would max out with 44.75 jsb and the shot count,??
Has anyone tried as yet,??
Scirroco