I was shooting a new to me 6.5 x55 . . .
You didn't mention the model of the rifle you were shooting. The only time I ever experienced
horizontal stringing was when I was sighting in a
new to me hunting rifle. Each sucessive shot walked horizontally away from the previous impact.
I later found out from the previous owner of the rifle, that this particular model was designed to be lightweight for field carry
and the
lighter barrel was extremely heat sensitive - thus causing the
string pattern.
Once I sighted it in, barrel
cold, I never had a problem using the rifle as intended - at least for the 1st shot.
