If you are wanting expansion the 220gr won't at subsonic velocity. If you want expansion either get some 151gr hp cast projectiles from shooternz off here or spend $3 a projectile and get some Lehigh controlled fracture 168gr, I think Dean Maisey has them.
If you are going to stick with the 220gr start at about 12ish grain trailboss and work down until they go subsonic.
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