Reply To: ED-GUN R-5M .22 CALIBER , tuning for heavy ammo ,

Forums PCP Airguns ED-GUN R-5M .22 CALIBER , tuning for heavy ammo , Reply To: ED-GUN R-5M .22 CALIBER , tuning for heavy ammo ,

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I have a .25 Huma in a .22 for the larger plenum area the reg max's out at 170 bar if I remember this is in a Hatsan BT65 .22 cal , there is a relationship between weight BC and twist rate if you can push them at xxx fps  but cant spin them fast enough for stabilisation for that xxx you loose .

This is the same in centre fire rifles 55 grn Vmax , Hornady BT 55 grn  , 52 SMK all super accurate at 3600 fps ish with a 1/14 twist barrel , then 53 grn Amax or Vmax much better BC if I remember right you need a faster twist for same fps , more revolutions for stability at same speed .