Hello shooting friends,
I'm a new Tikka owner and new to this forum.
I have a puzzle that I cannot solve. Perhaps what I describe below will sound familiar to any of you which may help me understand what's going on.

The variables:
* I have a new T3 Sporter in 223Rem, rate of twist 1:8
* I used reloaded cartridges using new Lapua cases, Lapu Scenar HPBT 69gr bullets, and 21gr VihtaVuori  N133 (COL 57,4 mm is well away from lands from lands and grooves)
* I also used Geco factory ammo 'Target' 55 grain bullet FMJ
* I have inspected the crown and barrel and have found no defects/ damage; barrel and crown seem to be in mint condition.

The issue:
During and after breaking in the rifle at 50 yards I noticed that the bullet holes (in competition paper bulls-eye targets) were not sharp edged but jagged. This happens with both my reloaded and Geco ammunition.
Normally I would guess that there is either a stability issue perhaps due to damaged crown or improper bullet weight for twist rate, or that the bullet jacket is not suitable for the fast twist and gets damaged as a result.

My inspection of barrel and crown as well as the two very different types of ammunition that I used seems to rule out both explanations.

Any suggestions ????

UPDATE: about 50 shots later the problem has now disappeared. Perhaps is was a burr somewhere damaging the bullet jacket? Whatever it was, it's ok now.