The recommended "break-in" period for Bersa Pistols is 200 - 300 rounds of quality manufactured ammunition made to S.A.A.M.I. specifications in a F.M.J.(Full Metal Jacket) - T.M.C.(Total Metal Case) Ball-type of projectile.
The Thunder 22 Pistols are designed to function reliably with High or Hyper Velocity (1260f.p.s. or faster) Ammunition.
Non-S.A.A.M.I. specification Ammunition or reloads are not recommended and may void your warranty.