A friend of mine owns a semi-custom Weatherby Mark V .340 Wby. Mag.; the rifle was a factory Mark V .300 Wby. Mag. which grouped under 3/4" at 100m.

The semi-custom Mark V .340 Wby. Mag. has a HS Precision Stock which has allunium block bedding, and has been glass beded. The barrel is a SS Shilen #4 contour. A muzzle brake was directly machined on to the fluted barrel; it is not removable. It has a Timminy Trigger. The rifle is shoots patterns not groups using handloads, or Weatherby (Norma) ammo. Its not the shooter because three of us have received the same results.

Please give me your thoughts of why this semi-custom rifle is shooting patterns not groups. Thanks