Post by: MarcSpaz
Shoot cardboard instead of paper to 100% confirm that the bullet is tumbling rather than cheap paper tearing.
In my experience, it is rarely the ammo selection causing a tumbling problem in a rifle. Generally speaking, even the wrong weight should be mostly stable out to 75-100 yards. Another reason I doubt its the ammo is because the .204 Ruger barrel should ONLY have a 1 in 12 twist rate and that "should" stabilize all commercially available 5mm rounds.
If rounds are actually ...
Shoot cardboard instead of paper to 100% confirm that the bullet is tumbling rather than cheap paper tearing.
In my experience, it is rarely the ammo selection causing a tumbling problem in a rifle. Generally speaking, even the wrong weight should be mostly stable out to 75-100 yards. Another reason I doubt its the ammo is because the .204 Ruger barrel should ONLY have a 1 in 12 twist rate and that "should" stabilize all commercially available 5mm rounds.
If rounds are actually ...